Which of the following best explains a way that a molecular clock can be used?
A) The number of DNA mutations in an organism is measured over time to determine how long it will take for a new species to evolve.
B) The number of DNA mutations in a species is compared to the number of DNA mutations in another species to determine the relative amount of time each species has been evolving.
C) The number of differences in a specific DNA sequence of two species is multiplied by a known mutation rate to determine the number of years of evolution that separate the two species.
D) The number of differences in the DNA sequences of two organisms of the same species is averaged to determine how many years of evolution have occurred.
Answers
According to the research, a molecular clock can be used to determine the number of differences in a specific DNA sequence of two species (c).
What is a molecular clock?It is a tool that allows us to relate the divergence time or the time elapsed since the divergence of two current lineages from their common ancestor.
It is based on analyzing and comparing the genetic material of organisms to establish the number of mutations.
Therefore, we can conclude that a molecular clock can be used to determine the number of differences in a specific DNA sequence of two species (c).
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Related Questions
A DRAWBACK of living in a
group is . . .
A. more likely to be eaten by predators.
B. having to look out for yourself.
C. being less obvious to predators.
D. increased competition for food and mates.
Answers
Answer: D
Explanation:
The drawback of living in a group is the increased competition for food and mates.
Option (D) is correct.
When individuals live in a group, they often have to compete with other group members for limited resources such as food and potential mates. This competition can create challenges and reduce the availability of resources for each individual within the group.
Living in a group can have advantages, such as enhanced protection against predators (option C) and increased vigilance through cooperative behavior (option B). However, the drawback arises from the fact that resources within an environment are finite, and when individuals live in close proximity, they must compete for those limited resources.
This competition can range from competing for access to food sources to competing for mating opportunities. Individuals within a group must invest time and energy in acquiring and defending resources, which can lead to increased stress, lower reproductive success, and potential conflicts within the group.
Thus, the increased competition for food and mates is a notable drawback of living in a group.
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Which of the following is NOT true about valence electrons?
A. Hydrogen has only 1 valence electron
B. Valence electrons are found in the outer energy level of an atom
C. Valence electrons are the furthest electrons from the nucleus
D. Lithium has 2 valence electrons
Answers
Lithium has two valence electrons is FALSE
Lithium have one valence electron in the second principal energy level.It has three atomic number. What is valence electron?It is an electron in the outer shell associated with an atom.It help in the formation of the chemical bonds if the outer shell is not closed.In neutral atoms, the number of valence electrons is equal to the atom’s main group number.To know more about valence electron here
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Which of the following is not used by scientists to obtain information?
Answers
Scientists obtain information from multiple sources, and as science tries to be as objective as possible, is important to use reliable sources.
Scientific journals are one of the main means where the scientists share their discoverings, so they are a reliable source, as well as books, another media where the information is collected.
Opinions are not a reliable source of information, as they are subjective and reflect the belief of the person giving the opinion, and are NEVER used by scientists to obtain information.
The Internet can be a great source of information, but this depends on the reliability of each website, as there are many useful resources for scientists available online, but also websites that don't have a reliable source to back up the information they are displaying.
How can color be use in balance?
Answers
Answer:
Color balance changes the overall mixture of colors in an image and is used for color correction. Generalized versions of color balance are used to correct colors other than neutrals or to deliberately change them for effect.
Explanation:
A family tree that shows how organisms are related to each other is called
taxonomy.
phylogeny.
comparative anatomy.
binomial nomenclature.
radioactive dating.
Answers
Answer: B
Explanation: Phylogeny is the correct answer.
Which state of matter does NOT take the shape of its container? Solids Liquids Gases please help ASAP
Answers
Answer: Liquid
Explanation:
Liquid because, liquids have a definite volume. However, because the particles can move about each other rather freely, a liquid has no definite shape and takes a shape dictated by its container.
In you own words, explain tragedy of the commons
Answers
a north American grassland is usually more productive when it contains diverse plant communities. how does the biodiversity of north American grassland affects is sustainability
Answers
Answer:
The biodiversity allows some plant communities to survive when the ecosystem experiences slightly different weather patterns
Explanation:
I hope this helps :)
A scientist is studying how the roots of plants absorb water and transport it to the rest of the plant. The scientist examines each structure in the roots and observes how those parts fit together to make an inference about how roots function.Which type of scientific thinking is the scientist using to make this inference?
Answers
The type of scientific thinking the scientist is using to make this inference is deductive reasoning.
What is deductive reasoning?
Deductive reasoning is a logical process in which a conclusion is drawn from premises or previously known information.
In this case, the scientist is examining the structures of the roots and using this information to make a conclusion about how roots function in absorbing and transporting water to the rest of the plant.
The scientist is using deductive reasoning to make an inference based on known information, which is a common approach in the scientific method.
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a) Smokers are more likely to get infections of their breathing system than non-smokers. Why do you think this might be? In bronchitis the tub
Answers
Smokers are more likely to get respiratory system infections than non-smokers due to the:
Impaired immune systemIncreased mucus productionWhat makes smokers liable for respiratory infections?Smokers are more likely to get respiratory system infections than non-smokers due to several reasons:
Impaired immune system: Smoking can damage the cells and tissues that make up the immune system, impairing its ability to fight off infections. This can make smokers more susceptible to bacterial and viral infections.Increased mucus production: Smoking can stimulate the cells in the respiratory system to produce more mucus, which can trap bacteria and viruses and make it more difficult for the body to clear them out.Learn more about respiratory infections at; https://brainly.com/question/1399450
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Cells spend the longest amount of time in Interphase to prepare for cell division.
True
False
Answers
imagine that you have two blades of grass. one is from a normal plant, and the other is from a mutant plant that cannot absorb water into its vacuoles. how will the structures of these two blades of grass compare? please choose the correct answer from the following choices, and then select the submit answer button. answer choices
Answers
The grass blade from the mutant plant will appear unpigmented compared to that from the normal plant. So, option (d) is correct.
What is mutant plant ?
The look of a plant's traits, most notably its foliage, flowers, fruit, or stems, can change as a result of mutations in plants, a phenomenon that happens naturally. For instance, a flower might display two colors that are precisely half and half. Frequently, the mutant plants recover their normal state the following season.
What is unpigmented ?
Pigments are a group of chemical substances used to give other materials their color. They have a strong hue. These chromogens are also known as biological pigments or biochromes, which primarily refers to the actual pigments.
Vacuole help in the storage and disposal of various substances. They can store food or other nutrients required by a cell.
Lytic vacuoles function as reservoirs for ions and metabolites like pigments, acids, and toxic substances.
As the grass blade are made up of cells and in mutant plant there is no vacuole so storage of pigment will be not there.
Therefore, The grass blade from the mutant plant will appear unpigmented compared to that from the normal plant. So, option (d) is correct.
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Who first identified DNA? A) Rosalind Franklin B) Erwin Chargaff C) Friedrich Miescher D) James Watson
Answers
Answer:
Friedrich Miescher
Explanation:
DNA was first identified by the Swiss biochemist Friedrich Miescher in 1869. Thus, the correct option is C.
The discovery of DNA was an accidental discovery made by Miescher in 1869 during the conduction of an experiment. He tried to isolate a substance from the white blood cells and came across this molecule which he thought to be protein.
But on further analysis, he found that it contains carbon, hydrogen, nitrogen, oxygen and phosphorus. Phosporus is not a part of the protein so he ruled out it to be protein. On further research, he found it to be present in the nucleus of all samples that he had studied and thus, named it nuclein.
Thus, the correct option is C.
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Why do some plants eat meat
Answers
Answer: They do this to obtain the vital nitrogen that they need to grow.
Explanation:
Using water more efficiently _______.
a.
protects the environment
b.
causes the loss of natural pollution filters
c.
increases water contamination
d.
all of the above
Answers
Answer:
a. protects the environment.
Explanation:
Using water efficiently means using it wisely and not wasting it. When we use water more efficiently, we reduce the amount of water we consume, which helps to conserve water resources. This is important because water is a limited resource, and by using it efficiently, we can ensure enough water is available for future generations.
By using water more efficiently, we can also protect the environment. Water is essential for many ecosystems and habitats, and by conserving water, we can help maintain the balance of these ecosystems. Additionally, using water efficiently can reduce the need for energy-intensive water treatment and distribution processes, which can help reduce greenhouse gas emissions and mitigate climate change.
So, using water more efficiently helps protect the environment but also helps conserve water resources for the future.
What advantages does a coelom provide the earthworm and the salamander?
Answers
Explanation:
The coelom refers to the body cavity derived from mesoderm germ layer and mainly found in multicellular animals and is positioned inside the body to surround and contain the digestive tract and other organs.
There are many advantages that coelom provides to the earthworm and the salamander. The digestive system of earthworms and salamanders is more complex, here coelomic fluid helps their body processes and assists as a hydrostatic skeleton.
The coelom's main advantage is its flexibility. The internal organs for example the heart, liver, lungs, and intestines develop, and they help to push into the coelom. The fluid of the coelom diminishes the organs for protecting the organs and also enables them to turn, bend, shift and move. In this way, coelom helps the animals internally to finish and run the system inside in the correct way. Coelom helps the earthworms and salamanders in building the correct system and protecting their organs to maintain and enable them to function properly.
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recal what you know about the functions of the skeletal system to complete the following questions
Answers
The skeleton provides a framework for ⇒ muscle and soft tissue attachment.
Name one organ protected by the ribcage. ⇒ Heart, lungs, liver
Blood is formed in the:
red bone marrow.Calcium is released and deposited in the bones and blood to maintain homeostasis. calcium, phosphorus, minerals, fat is stored in the bones.When muscles: ⇒ contract, the bones attached to them move.
What is the skeletal systemThe bony structure of the skeleton serves as a foundation for providing support and attaching soft tissues. The heart is safeguarded by the ribcage.
The bone marrow is responsible for producing blood. In order to keep the body in balance, calcium is discharged and stored in both the bloodstream and bones. The bones serve as a storage site for calcium. The movement and locomotion of the body occurs as a result of bones connected to contracting muscles.
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See full text below
Recall what you know about the functions of the skeletal system to complete the following questions. The skeleton provides a framework for and soft tissue attachment. Name one organ protected by the ribcage. Blood is formed in the bone marrow. is released and deposited in the bones and blood to maintain homeostasis. is stored in the bones. When muscles , the bones attached to them move.
Most articles pass right through the atom, this means that most of the atom is
Answers
Most articles pass right through the atom, this means that most of the atom is an empty space.
What is an atom?An atom is described as a particle that consists of a nucleus of protons and neutrons surrounded by a cloud of electrons.
Protons and neutrons make up the core nucleus of an atom, which is encircled by an electron cloud. In relation to the size of the atom as a whole, the nucleus is exceedingly small.
As a result, the electrons surrounding the nucleus are the primary target of interactions when particles or even light pass through an atom. The majority of the atom's remaining space, which includes the nucleus, is vacant.
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As part of a class project, Claire needs to draw a food chain of the animals she sees in a zoo. Where in the food chain should she place rabbits?
Answers
Answer: She should place rabbits as a primary consumer in the food chain.
Explanation: Rabbits are herbivores (an animal that only feeds on plants). Therefore rabbits are primary consumers.
What is Roosevelt trying to accomplish with this fireside chat?
He intends to gain support for his banking agenda.
He wishes to encourage Americans to trust members of the banking industry.
He wants Americans to make a greater effort to understand how banking works.
He hopes to inspire younger Americans to work in the banking industry.
Answers
Answer:
He intends to gain support for his banking agenda.
Explanation:
edguenity told m/ checked it.
Answer:
He intends to gain support for his banking agenda.
Explanation:
Basic biology. Please help!
Answers
Answer:
TGGCAATCG
Explanation:
Remember:
Adenine always pairs up with either Uracil (RNA) or Thymine (DNA)
Cytosine always pairs up with Guanine (Both DNA and RNA)
S
1. What two scientific theories support the Big Bang?
Newton's Law of Gravity and the Cosmological Principle
Answers
The 1920s discovery by Hubble of a correlation between galaxy speed and distance from Earth and the 1960s discovery of cosmic microwave background radiation are two significant scientific findings that lend considerable support to the Big Bang idea.
Which two concepts underlie the big bang theory?A wide variety of known phenomena, like as the abundances of the light elements, the CMB, large-scale structure, and Hubble's law, are fully explained by the Big Bang theories.
What are the Big Bang theory's supporting facts, according to the Regents?Measured elemental abundances, observed space expansion, and the finding of the cosmic microwave background are three crucial pieces of observational data that support the Big Bang idea (CMB).
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What are the products of
photosynthesis?
A. oxygen and water
B. carbon dioxide and water
C. oxygen and glucose
Answers
Answer: Oxygen and Glucose
Explanation:
Plants take in Carbon Dioxide and water to begin the process of photosynthesis.
The water becomes oxidized, losing electrons, and carbon dioxide is reduced, gaining electrons.
The water is transformed into oxygen, and the carbon dioxide is transformed into glucose.
List 5 factors/things that can contribute to decreased sperm and egg production in males and females respectively.
Answers
2. Weight
3. Alcohol
4. Drugs
5. Depression
what is the temperature of a glass of water
Answers
Answer:
without Ice: between 50 and 72 degrees °F
With Ice: 32°F
Explanation:
Normal water: between 50 F and 70 F
The process of chemically digesting protein primarily begins in the stomach. The process continues through the gastrointestinal tract as large protein molecules are dismantled to yield dipeptides, tripeptides, and single amino acids.
a. True
b. False
Answers
A common misconception people have is that sugar is energy and energy is sugar but you know better. Create a clear explanation that could be used to clear up this misconception. Your answer could include information, formulas, etc. and should be two to three sentences long.
Answers
Sugar is a carbohydrate, a source of energy, and an important component of the diet. There are different types of sugars like monosaccharides, disaccharides, and polysaccharides depending on the number of monomer units present.
Sugar is naturally present in some foods like dairy products and fruits. It is also synthesized artificially and is added to a variety of foods. A moderate intake of sugar in the diet is acceptable.
Sugar intake in the diet should be 10% of the total energy intake. Consuming too much sugar can cause many health-related problems like diabetes, tooth decay, and obesity.
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1. Which of the following indicate the correct order of organization in multicellular organisms? (from smallest to largest)
a. Tissues, cells, organ systems, organs, organisms
b. Cells, tissues, organs, organ systems, organisms
c. Organism, Organ systems, organs, tissues, cells
d. Cells, organs, tissues, organ systems, organism
Answers
How is a reference point defined?
A. The initial position of an object from which its motion is described
B. The central point on a coordinate plane
C. The point where the direction the object is moving in changes
OD. The final position of an object when it is no longer in motion
SUBMIT
Answers
A reference point is defined as the initial position of an object from which its motion is described.
What is Reference point?This is used as a standard for evaluation or measurement of properties in a body.
Option A was chosen because the motion of the object is described through comparison with the initial position.
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Come on anyone help please I need this to be done by tomorrow. please
Answers
Answer:
1400
Explanation:
Not sure though
subtract
urine=kidneys 1500
sweat= skin. 100