What invertebrate animals are the ancestors of tetrapods
A)jellyfish
B)cartilaginous fish
C)jawed fish
D)jawless fish
Answers
Answer:
D I believe
Explanation:
Related Questions
This connective tissue is packed with parallel collagen fibers, attaches muscles to bone, and can withstand great stress when pulled in one direction.
Answers
Answer: Tendons are connective tissues connecting muscles to bones
They are made of elastic collagen fibers and are flexible and can withstand to an extent of stress
What are three ways that climate change could affect the people and ecosystems of California ?
Answers
in which country was the goldfish originally domesticated?
Answers
The goldfish was originally domesticated in China, where it has been selectively bred for ornamental purposes for more than a thousand years.
Goldfish were initially kept for their meat in China, but as early as the Tang Dynasty (618-907 AD), they began to be kept as ornamental fish in ponds and artificial lakes. Over time, breeders in China and Japan developed different varieties of goldfish with distinctive colors, shapes, and sizes, leading to the wide variety of goldfish that we see today.
From China, the domesticated goldfish was introduced to other parts of the world, including Europe and North America. Today, goldfish are one of the most popular ornamental fish species in the world and are kept by hobbyists and enthusiasts in many different countries.
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7. What is the proper sequence of events in maintaining homeostasis?
a. 1. Stimulus, 2. Receptor, 3. Signal, 4. Response
b. 1. Stimulus, 2. Response, 3. Signal, 4. Receptor
C. 1. Receptor, 2. Stimulus, Signal, 4. Response
d. 1. Signal, 2. Receptor, 3. Stimulus, 4. Response.
Answers
Answer:
a.
Explanation:
stimulus, receptor detects changes, input info and output info(signal), response
a. 1. Stimulus, 2. Receptor, 3. Signal, 4. Response
Homeostasis is any self-regulating process by which an organism tends to maintain stability while adjusting to conditions that are best for its survival.
If homeostasis is successful, life continues; if it's unsuccessful, it results in a disaster or death of the organism.
Proper sequence of events in maintaining homeostasis:
Stimulus: Produces change in variable, change detected by receptor. Input: Information sent along efferent pathway to control center. Output: Information sent along efferent pathway to activate effector. Response: Feeds back to influence magnitude of stimulus and returns variable to homeostasis.Therefore, the correct option is a.
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Sickle cell disease provides an example for which principle of molecular genetics? A. A point mutation always causes a significant change in phenotype. B. A point mutation always causes a change to an amino acid sequence, which may affect phenotype. C. A significant change in phenotype may cause a genetic mutation. D. A change to one amino acid in a protein may cause a significant change in phenotype.
Answers
Answer:D. A change to one amino acid in a protein may cause a significant change in phenotype.
A population of beetles is currently 60 beetles at n=0. The beetle population has an intrinsic growth rate of 150% each generation. The environment can sustain a maximum population of 130 beetles. Find the population of the next three generations, 'y_1' ' 'y_2' and 'y_3' of beetles
Answers
The population of beetles in the next three generations, considering the carrying capacity, is y1 = 130 beetles, y2 = 130 beetles, and y3 = 130 beetles.
The population of beetles can be calculated using the formula: y = y0 * (1 + r)^n, where y is the population at a given generation, y0 is the initial population, r is the intrinsic growth rate (expressed as a decimal), and n is the number of generations.
Given that the initial population (y0) is 60 beetles and the intrinsic growth rate (r) is 150% (or 1.5), we can calculate the population for the next three generations.
For the first generation (y1), we substitute y0 = 60, r = 1.5, and n = 1 into the formula: y1 = 60 * (1 + 1.5)^1 = 60 * 2.5 = 150 beetles.
For the second generation (y2), we substitute y0 = 60, r = 1.5, and n = 2 into the formula: y2 = 60 * (1 + 1.5)^2 = 60 * 6.25 = 375 beetles.
For the third generation (y3), we substitute y0 = 60, r = 1.5, and n = 3 into the formula: y3 = 60 * (1 + 1.5)^3 = 60 * 15.625 = 937.5 beetles.
However, since the environment can only sustain a maximum population of 130 beetles, we need to consider the carrying capacity.
To find the population at each generation while considering the carrying capacity, we compare the calculated population with the carrying capacity and use the smaller value as the population.
For y1, the population is 150 beetles, which exceeds the carrying capacity of 130 beetles. Therefore, y1 = 130 beetles.
For y2, the calculated population is 375 beetles, which is also above the carrying capacity. Thus, y2 = 130 beetles.
For y3, the calculated population is 937.5 beetles, which is still above the carrying capacity. Therefore, y3 = 130 beetles.
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do terrestrial dicot and monocot roots have root caps?
Answers
Answer:
Yes The cap is present on all roots except those of parasites and in mycorrhizal roots .The roots of aquatic plants have vestigial caps when young but the initial soon die and the cap disappear. The calyptrogen initiate root cap in monocots. In the dicots the cap appears to be a specialized development of the epidermis. In Monocots the cap has attained independent origin.
What type of molecule did you make?
AUG GGU UGU UAA
Answers
AUG GGU UGU UAA is an amino acid sequence, which further forms proteins.
What are amino acids?Proteins are made up of substances called amino acids. Proteins and amino acids are the components of life. Amino acids are the byproducts of the digestion or breakdown of proteins.
Amino acids are used by the human body to create proteins that aid in dissecting food.
There are mainly 20 types of amino acids. 10 are essential amino acids, while 10 are non-essential amino acids. Our body synthesizes non-essential amino acids, while we have to include essential amino acids in our diet.
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2. To know more about preservatives.
To know about the different methods of preservation.
a) Collect the wrappers of frozen and canned food items and milk.
b) Find about the preservatives present in these food items.
c) List the various preservatives and methods of their preservation.
Answers
A chemical preservative stops items from decomposing. Some preservatives are used to cure wood or metal, while others are applied to food. Food preservation is "the science that deals with the process of preventing food from decaying or spoiling so that it can be stored in a fit condition for future use." Food quality, edibility, and nutritional content are all guaranteed via preservation.
They are not tainted with harmful substances or dangerous organisms.It does not lose its excellent color, texture, taste, or nutritional content.What are the different methods of Food Preservation?Drying: The oldest method of food preservation is drying. By using this technique, water activity is reduced, preventing bacterial growth. Drying makes food lighter so it can be transported more readily. Modern drying methods include bed dryers, fluidized bed dryers, freeze drying, shelf dryers, spray drying, commercial food dehydrators, and household ovens, in addition to the traditional methods of using the sun and wind. Examples of dried items using this technique include meat and fruits, apples, apricots, and grapes.
Freezing: Food prepared and frozen is kept in cold storage. Although potatoes can be controlled in dark areas, potato preparations must be frozen.
Smoking: Food is cooked, flavored, and preserved through smoking, which exposes it to wood smoke. Meats and fish are typically smoked because the smoke has antibacterial and antioxidant properties. Assorted smoking techniques are employed, including hot smoking, cold smoking, smoke roasting, and smoke baking. Smoking increases the risk of cancer when used as a preservative.
Vacuum packing creates: By making bottles and bags impermeable, vacuum packing creates a vacuum. Bacteria perish because there is no oxygen in the newly generated vacuum. Typically applied to dry fruit.
Salting and Pickling: Curing, commonly referred to as salting, removes moisture from goods like meat. Pickling is the process of preserving food in a salt solution (brine) or vinegar (acetic acid); in Asia, food is sometimes preserved in oil. At a 20% concentration, salt kills and stops the growth of microorganisms. Pickling can be done in many ways, including chemical pickling and fermentation pickling. To extend the shelf life of commercial pickles, sodium benzoate or EDTA is added.
Sugar: Fruits can be preserved with sugar in syrup form or crystallized form, depending on whether the material to be preserved is boiled in the sugar until it crystallizes, like candied peel and ginger. Another use is for fruit superficially coated in sugar syrup and then glazed. Alcohol and sugar are combined with preserving upscale foods like fruit in brandy.
Lye: Lye, also referred to as sodium hydroxide, makes food alkaline and inhibits the growth of microorganisms.
Canning and bottling: Sealing cooked food in sterile bottles and cans is the definition of canning and bottling. Boiling the container destroys or weakens bacteria. Various amounts of time or space are used for cooking food. The food is more at risk of rotting after the can or bottle has been opened.
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Question 1 of 10
Which statement best describes the limits of science?
A. Science cannot answer quations about what people should do.
B. Science cannot answer questions about the natural world.
C. Science can answer any question.
D. Science can answer only mathematical questions.
SUBMIT
Answers
The right answer is D . A question about what individuals or peoples should do cannot be answered by science.
Science is a system that uses information derived through observation, experimentation, and other techniques to attempt to comprehend natural occurrences. Because of this, it has been able to learn about practically all elements of the world and find answers to all kinds of questions, including challenging or complex ones, through research and the scientific method. Science, however, cannot provide answers to concerns about characteristics that cannot be observed, tested, or that depend on perception because it is based on experimentation and observation.
So, it cannot instruct individuals what to do or how to act, even though it is acceptable and contains all the known facts.
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Which letter shows a transport protein? DUE IN 5 MINS!
A
B
C
D
E
Answers
Answer:
The answer is simple.
Explanation:
B, because this is the only apparent answer. It is being transported from something. I'm sure there's some scientific information to back this up.
The reason I said that is because I'm only in 7th grade, and I'm not yet learning about that in science. But you can't blame me for trying. I'm glad to help out if this is correct, but I'm sorry if this is no help.
for a signal to travel from a neuron across a synapse and stimulate a response, the postsynaptic target cell must
Answers
For a signal to travel from a neuron across a synapse and stimulate a response, the postsynaptic target cell must have receptors for the neurotransmitter released by the presynaptic neuron.
These receptors bind to the neurotransmitter, triggering a series of chemical reactions within the postsynaptic cell that ultimately lead to the desired response. Additionally, the postsynaptic cell must be able to generate an action potential if the combined signal from multiple synapses is strong enough to reach the threshold for firing.
For a signal to travel from a neuron across a synapse and stimulate a response, the postsynaptic target cell must receive and integrate the neurotransmitters released by the presynaptic neuron, leading to a change in its membrane potential. This process may result in either excitation or inhibition of the postsynaptic cell, ultimately determining whether or not an action potential is generated.
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What are 3 differences between the 3 types of macromolecules
Answers
: Hope this helps
Explanation:
Proteins are made of amino acids.
Nucleic Acids are made of nucleotides.
Lipids are made of fatty acids.
Carbohydrates are made of monosaccharides.
Carbohydrates are a source of energy.
Lipids store energy.
Nucleic Acids hold genetic information.
Proteins, carbohydrates, lipids, and nucleic acids are the four major classes of biological macromolecules.
Proteins are the polymers of amino acids. Lipids are the polymers of lipid monomers (fatty acid and glycerol). Nucleic acids are the polymers of nucleotides. And, Carbohydrates are polymers of monosaccharides.Examples of proteins-enzymes and some hormones. Examples of carbohydrates -glucose, fructose, starch, and cellulose. Examples of lipids- oil, butter, wax, cholesterol. Examples of nucleic acids- DNA and RNA.The uses of proteins are - enzymes, receptors, structural, energy, etc. The uses of carbohydrates are - energy, storage, and structure. The uses of lipids are protection, energy, storage, and chemical messengers. The use of nucleic acids is genetic information.Learn more about macromolecule
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The initial period of population growth for a species in an environment is _______. a. linear b. exponential c. slow d. negative Please select the best answer from the choices provided A B C D
Answers
Answer:
b
Explanation:
Initial period of population growth is most likely to be exponential and then slowly reach a point of "equilibrium" where the population is stable. Meaning the death and the birth are balancing it out.
Answer:
b. exponential
Explanation:
A species that has a variant of cohesin that makes it extremely unstable and susceptible to degradation by proteases would be expected to:
Answers
A species with a variant of cohesin that is extremely unstable and susceptible to degradation by proteases would be expected to experience challenges in proper chromosome segregation during cell division.
Cohesin is a protein complex that plays a crucial role in holding sister chromatids together after DNA replication until anaphase, ensuring accurate chromosome segregation. Proteases are enzymes that degrade proteins by breaking peptide bonds. In this scenario, the unstable cohesin would be rapidly degraded by proteases, compromising its ability to hold sister chromatids together effectively, this could lead to premature separation of chromatids or uneven distribution of genetic material between daughter cells during cell division. As a result, the species may experience a higher rate of genetic abnormalities, chromosomal imbalances, or aneuploidy, which could impact its overall fitness and survival.
Moreover, cohesin's instability might also affect DNA repair processes, as it plays a role in double-strand break repair via homologous recombination. Consequently, the species could have an increased mutation rate and be more prone to genetic diseases and disorders. In conclusion, a species with an unstable cohesin variant susceptible to protease degradation would likely face challenges in accurate chromosome segregation and DNA repair, potentially resulting in genetic abnormalities and reduced survival prospects.
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what are the functions of the vertebral column and braincase
Answers
Answer:
Explanation:
vertebral column: the vertebral column, also called the spinal column, spine, or backbone, in vertebrate animals, is the flexible column extending from neck to tail, made of a series of bones, the vertebrae. The major function of the vertebral column is the protection of the spinal cord; it also provides stiffening for the body and attachment for the pectoral and pelvic girdles and many muscles. In humans, an additional function is to transmit body weight in walking and standing.
braincase: It houses the brain and cranial nerves, and it partially or completely encloses some cephalic sense organs (e.g., inner ear, eyeball, olfactory region). Moreover, the braincase provides an area of attachment for the musculature of the jaw and neck, as well as the bony articulation of the neck itself.
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The vertebral column provides axial support to the body and houses the spinal cord, while the braincase encloses and protects the brain. The functions of the vertebral column and braincase are given.
Functions of the Vertebral Column:The vertebral column performs the following functions:Provides protection: The vertebral column encases the spinal cord, which serves as the central nervous system conduit. It provides protection to the spinal cord, which is an essential part of the nervous system.Supports the upper body: The vertebral column helps to support the weight of the upper body. This weight-bearing role is crucial to the functioning of the lower back.
Supports the neck: The vertebral column serves as a support for the neck and the head. The neck is essential for movements of the head. Without a functioning neck, it would be impossible to move the head from side to side or up and down. Provides a flexible framework: The vertebral column provides a flexible framework that allows the body to bend and twist.
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in a gene pool, the Z allele frequency is 89% and the z allele frequency is 11%. Determine the frequency of heterozygous (Zz) individuals in the population
Answers
Answer:
Explanation:
The frequency of heterozygous individuals can be calculated using the Hardy-Weinberg equation:
p^2 + 2pq + q^2 = 1
where p is the frequency of one allele (Z in this case) and q is the frequency of the other allele (z).
Given that the Z allele frequency is 89%, we can calculate q as:
q = 1 - p
q = 1 - 0.89
q = 0.11
Using this value for q and the given value for p, we can calculate the frequency of heterozygous individuals as:
2pq = 2(0.89)(0.11) = 0.196
So, the frequency of heterozygous (Zz) individuals in the population is 0.196 or 19.6%.
24.a)What is a joint? b) Give three functions of the vertebral column
Answers
A) A joint is a point where bones come together, allowing movement and providing stability.
b) The vertebral column functions to support and protect the body, enable movement and flexibility, and bear weight while absorbing shock.
A) A joint is a specialized structure that connects bones together, allowing for movement and providing stability to the skeletal system. Joints can be found throughout the body, ranging from highly mobile joints like the ball-and-socket joint in the hip, to less mobile joints like the sutures in the skull.
B) The three functions of the vertebral column are:
1) Support and Protection: The vertebral column serves as the main support structure for the body, providing a framework for attachment of muscles, ligaments, and tendons. It also protects the delicate spinal cord running through the spinal canal within the vertebral column.
2) Movement and Flexibility: The vertebral column consists of individual vertebrae that are connected by joints, allowing for a wide range of movements such as bending, twisting, and flexing. These movements enable activities like walking, running, and various physical tasks.
3) Weight Bearing and Shock Absorption: The vertebral column helps distribute the body's weight evenly and efficiently, minimizing stress on individual bones and joints. It acts as a shock absorber, reducing the impact forces transmitted to the spinal cord and other structures during activities like jumping or running.
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Muscle fiber features called ___________ are repeating units within muscle fibers that act as the functional units of muscle contraction
Answers
Muscle fiber features called Sarcomere are repeating units within muscle fibers that act as the functional units of muscle contraction.
Because the actin and myosin filaments that drive their contraction are arranged into repeating arrays, or sarcomeres, that have a striated microscopic appearance, skeletal and cardiac muscles are known as striated muscles.
What is the purpose of muscle fiber?
Muscle fibers' main function is to regulate the forces that go through the body. The quadriceps and gluteus maximus shorten as the body changes from a seated to a standing position to help the body resist gravity. Similar activities may be used to create force to move a resistance.
Where can you find muscle fiber?
Except for the heart, smooth muscle fibers are spindle-shaped, involuntary, and located in the walls of hollow visceral organs (such as the liver, pancreas, and intestines). Skeletal muscle fibers can be found in muscles that are attached to bones.
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HURRRRRYYYY WILLL MARK BRAINESESSSSTTT!!!!
Which of the following is the correct order of anaerobic respiration?
A.) Glycolysis, fermentation
B.) Fermentation, glycolysis
Answers
Answer:
Its obviosly A
Which of these should be creative to help scientist make reliable conclusions
Answers
What controls an organism’s development and growth of body structures?
Answers
Answer:
Developmental genetics is the study of how genes control the growth and development of an organism throughout its life-cycle. Genes code for proteins, and proteins build bodies: a salmon fry hatching from an egg.
How would the environment change if there were fewer plants to carry out photosynthesis?.
Answers
If there were fewer photosynthesising plants, there would be more oxygen in the atmosphere, which would change the environment.
Why is photosynthesis such an important process?The primary goal of photosynthesis is to convert solar energy to chemical energy that can be stored for use at a later time. The primary purpose of this process is to supply energy to the planet's living systems. It is not very effective by the standards of human engineering, yet it works.
Is photosynthesis a specific type of reaction?Photosynthesis is an instance of an endothermic reaction. This indicates that it requires energy to occur. Light is absorbed by the green pigment chlorophyll, which is present in plants. Plants do not have chloroplasts, which contain chlorophyll, in their palisade or spongy mesophyll cells.
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If haploid for an organism is 30 individual chromosomes, how many individual chromosomes would a somatic cell for this organism possess?
a. 15
b. 10
c. 90
d. 60
e. 30
Answers
A somatic cell for this organism would possess 60 individual chromosomes. Therefore, the correct answer is d. 60.
If the haploid number of chromosomes for an organism is 30, it means that each gamete (sex cell) of that organism contains 30 individual chromosomes. Gametes are haploid cells, meaning they only have one set of chromosomes.
In contrast, somatic cells are diploid cells, meaning they contain two sets of chromosomes. The diploid number of chromosomes is typically denoted as 2n. Therefore, to determine the number of individual chromosomes in a somatic cell, we multiply the haploid number (n) by 2.
For the given organism with a haploid number of 30 individual chromosomes, a somatic cell would possess:
2n = 2 * 30 = 60 individual chromosomes.
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Scientit can ue elective breeding to produce chicken with no feather. Explain how a chicken with no feather can be produced by elective breeding
Answers
Answer:
Artificial selection and inbreeding.
Explanation:
The chicken with no feather is developed by years of natural breeding techniques. The breeding species are selected by man. Therefore, it is formed by artificial selection and inbreeding methods.
The author of this passage would most likely agree with which statement?
А
Frequent droughts are beneficial for the planet.
B
Rising ocean temperatures have made coral reefs healthier.
Governments should enact regulations to protect biodiversity.
D
UN scientists have overestimated the number of species at risk of extinction.
Answers
Answer:its c
Explanation:
Explain what the relationship is between predators and scavengers in the African savanna.
Answers
What are scavengers in the savanna?
Image result for Explain what the relationship is between predators and scavengers in the African savanna.
Vultures, hyenas, jackals, and even predators like lions often scavenge food.
This lioness had just killed a full-grown buffalo. ...
Hyenas are the undisputed top scavengers of the African savanna, with specialized jaws that can crush bones. ...
Black-backed jackals are often spotted at the scene of a lion kill.
Student A sprays perfume at her seat in the front of the room. Ten minutes later Student B, at the
back, smells the perfume. Which of the following is the best explanation of the delay in Student B
smelling the perfume?
Answers
Answer:
it would be c diffusion
Select TWO statements that describe what the scientists will observe in the ecosystem after fossil fuels have been extracted and burned. Group of answer choices There is more available space for carbon to become fossil fuels. There is less carbon in storage. There will be less carbon in the water. There is more carbon in the atmosphere. There will be more carbon respired by organisms. There will be less carbon released through decomposition.
Answers
Answer: There is more carbon in the atmosphere. There will be more carbon respired by organisms.
Explanation:
Fossil fuels are the fuels which are produced after millions of years ago by the decomposition and degradation of the organic matter generated after the death of the plants and animals. The coal, petrol, and natural gas are commonly used fossil fuels as cooking gas and automobile fuels.
The burning of the fossil fuels releases energy in the form of heat and a lot of toxic gases like carbon monoxide and carbon dioxide are released in the atmosphere which increases the concentration of carbon in the air and eventually the living beings will respire more amount of carbon dioxide.
the food substance which when tested with iodine solution turns blue-black is A . protein B. oil C.vitamin D. starch
Answers
Answer:
Explanation:
the food substance which when tested with iodine solution turns blue black is starch.