it is estimated by a wide body of scientists that in recent decades we have begun another mass extinction event on earth. amphibians in particular have been in decline, sometimes due to climate change, and they therefore provide a possible early sign of dramatic biodiversity change to come. with respect to climate change and natural selection acting upon a population of one species of frog in a tropical rainforest, which of the following describes the outcomes of the mutations of dna sequences of the frog genome that are inherited by offspring? the mutations inherited will lead to decline and extinction of the frog species. the offspring will only inherit mutations that are beneficial for the current environment. the offspring will inherit alleles that will only speed the decline and extinction of the species. the mutations inherited may result in beneficial alleles for one environment, but deleterious in another.
Answers
Natural selection and climatic change-induced mutations in a population of one species of frog in a tropical rainforest may produce alleles that are advantageous in one habitat but harmful in another.
Do we currently face a mass extinction?Sartori. The Earth's life has barely survived five cataclysmic extinction events. There were no humans present during the massive volcanic eruptions or the asteroid crash. But many experts now think that a sixth major extinction is currently underway. And this time, they cite the pervasive presence of humans on Earth as the cause.
What are the signs that the sixth mass extinction is currently underway?Animal species are going extinct, there is a "biological annihilation," frogs and insects are dying off at record rates, and invading alien species are displacing native ones. According to a United Nations report, up to 1 million species are in danger of going extinct. For more stories, go to Business Insider's home page.
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Related Questions
why was detergent added to the solution
Answers
The detergent was added to the solution so that we can allow the sodium bicarbonate to enter the cell for the reaction to take place.
Photosynthesis is a chemical process by which the plant basically prepares its own food using water, oxygen as well as sunlight. In an experiment to study the rate of photosynthesis, detergent was basically added to the solution and this was done because soap is able to break down molecules which are present on the surface of the leaf.
This allows the bicarbonate solution to easily enter into the leaf and allow the reaction to take place. The sodium bicarbonate here basically serves as the source of carbon for photosynthesis to occur.
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--The given question is incomplete, the complete question is
"We are conducting an experiment to understand the rate of photosynthesis. We add detergent to the solution. Why was detergent added to the solution?"--
EASY QUESTION! MARKING BRAINILEST! QUESTION IN PICTURE!
Answers
1) e 1
2) c 2
3) b 3
4) d 4
5) a 5
Answer:
1) e 1
2) c 2
3) b 3
4) d 4
5) a 5
Explanation:
What TYPE of nucleic acid is found in the Ebolavirus?
Answers
Answer:
virion nucleic acid
The virion nucleic acid of Ebola virus consists of a single-stranded RNA with a molecular weight of approximately 4.0 x 10(6).
Explanation:
QUICK!
CAN SOMEONE PLEASE GIVE ME A SIMPLE ANSWER FOR THIS?
What is the difference between primary succession and secondary succession?
Answers
The endosymbiotic theory explains how organelles inside eukaryotic cells are descended from ancient _____
Unicellular prokaryotic organisms
Unicellular eukaryotic organisms
Multicellular prokaryotic organisms
Multicellular eukaryotic organisms
Answers
The endosymbiotic theory explains how organelles inside eukaryotic cells are descended from ancient unicellular prokaryotic organisms.
What is the Endosymbiotic Theory?The endosymbiotic theory, often known as symbiogenesis, is the idea that the first eukaryotic cells evolved through a symbiotic relationship between two or more prokaryotic organisms. It states that organelles inside eukaryotic cells, such as mitochondria and chloroplasts, were once free-living unicellular prokaryotic organisms that were engulfed by a host cell and evolved into specialized cell components over time.
How does the Endosymbiotic Theory explain the origin of eukaryotic organelles?According to the endosymbiotic theory, eukaryotic cells arose from the interaction of several distinct types of prokaryotic organisms. The theory claims that a host cell first consumed an aerobic bacteria, allowing the development of mitochondria. Later, it took up a cyanobacteria, resulting in the development of chloroplasts in some eukaryotic organisms.
This theory explains how eukaryotic cells came to be and how their organelles evolved, allowing them to accomplish complex cellular functions. This has implications for the evolution of all life on earth, as it means that multicellular organisms emerged from simpler, single-celled organisms in a process of co-evolution that resulted in the development of complex, differentiated organisms.
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does the roan phenotype illustrate a case of incomplete dominance or a case of codominance? explain.
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Yes, the Roan phenotype illustrates a case of incomplete dominance because of the fact that it is a mix of white and red phenotypes.
There are three phenotypes possible in incomplete dominance. Here, they are red, white, and roan, roan being a mix of red and white. When Roan phenotype, obtained in F1 progeny, undergoes selfing, it should produce a phenotypic ratio of 1:2:1. If the expected phenotypic ratio is obtained, Roan if unexpectedly a case of incomplete dominance.
Let red phenotype be expressed by RR genotype and white color be expressed by rr genotype. When RR is crossed with rr, all of the genotype that comes out after crossing is Rr. Rr is a mixed genotype of the two and is thus a heterozygote and produces a mix phenotype called roan. All of these phenotypes demonstrate the coat color of the cattle. When roan phenotypes are crossed, the phenotypic and genotypic ratio of 1:2:1 is produced. Thus, the coat colors are inherited through incomplete dominance.
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Complete question is:
In Shorthorn cattle, coat color may be red, white, or roan. Roan is an intermediate phenotype expressed as a mixture of red and white hairs.
red x red = all red
white x white = all white
red x white = all roan
roan x roan = 1/4 red : 1/2 roan : 1/4 white
How is coat color inherited? What are the genotypes of parents and offspring for each cross?
Does the roan phenotype illustrate a case of incomplete dominance or a case of codominance? Explain.
HELO ME PLEASE IM BEING TIMED
Answers
genes, acting in conjunction with the environment, control patterns of _________________ in plants.
Answers
Genes, acting in conjunction with the environment, control patterns of growth, development, and responses to environmental changes in plants.
Genes play a crucial role in regulating various aspects of plant biology, including growth, development, and responses to environmental stimuli. Plants possess a diverse set of genes that are responsible for controlling these patterns. Through intricate genetic networks and interactions, genes coordinate the processes of growth and development in plants, such as seed germination, root and shoot growth, leaf formation, flowering, and fruit development.
However, the expression and function of these genes can be influenced by environmental factors such as light, temperature, water availability, nutrient levels, and biotic interactions. The interaction between genes and the environment determines how plants respond and adapt to their surroundings. Environmental cues can trigger gene expression or modulate the activity of certain genes, leading to specific growth patterns, developmental changes, or physiological responses in plants.
Therefore, genes, acting in conjunction with the environment, play a pivotal role in controlling the patterns of growth, development, and responses to environmental changes in plants. This integration of genetic and environmental factors enables plants to adapt and thrive in different ecological conditions.
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why is it important that your goals should be measura
ble
Answers
Answer:
Measurable goals are important in order to clearly identify exactly what it is you want to achieve and when the goal has been achieved. Having a measurable goal can improve excitement and motivation, because you know when you've reached your destination and achieved the goal.
Explanation:
Explanation:
Measure able goals helps you define exactly what you want to achieve in the future.What is a mismatch repair
Answers
Answer:
A DNA mismatch repair removes and replaces mis-paired bases (ones that were not fixed during proofreading), so it basically replace mis-paired bases with the right ones
can outside factors affect how we grow?
Answers
Answer:
Yes, all outside factors can affect the way we grow and excel in life.
Examples of factors:
1) Influences by others or the internet
2) news
3) actions of others
4) society and community
I hope this helped :)
What are isobars?
O lines on a weather map that connect places of equal temperature
O lines on a bar graph showing pressure measurements
O lines on a weather map that connect places of equal wind speed
O lines on a weather map that connect places of equal pressure
Answers
Answer:
D.
Explanation:
a line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.
Treating circulatory disease: Angioplasty is a medical procedure in which an obstructed blood vessel is widened. In some cases, a wire mesh tube, called a stent, is placed in the vessel to help it remain open. A study was conducted to compare the effectiveness of a bare metal stent with one that has been coated with a drug designed to prevent reblocking of the vessel. A total of 5314 patients received bare metal stents, and of these, 832 needed treatment for reblocking within a year. A total of 1119 received drug-coated stents, and 140 of them required treatment within a year. Can you conclude that the proportion of patients who needed retreatment is less for those who received drug-coated stents? Let p₁ denote the proportion of patients with bare metal stents who needed retreatment and p₂ denote the proportion of patients with drug-coated stents who needed retreatment. Use the a=0.05 level of significance and the P-value method with the TI-84 Plus calculator.
Answers
Based on the given information, we can analyze the effectiveness of bare metal stents compared to drug-coated stents in terms of retreatment rates. So as per the given information the P-value is 0.151.
To determine if the proportion of patients needing retreatment is lower for those who received drug-coated stents, we can conduct a hypothesis test using the given sample proportions and the P-value method with a significance level of α=0.05.
The null hypothesis (H₀) states that there is no difference in the proportion of patients needing retreatment between bare metal stents and drug-coated stents (p₁ = p₂). The alternative hypothesis (H₁) states that the proportion of patients needing retreatment is lower for drug-coated stents (p₁ > p₂).
By performing the hypothesis test and calculating the P-value, we can assess whether the observed data provides enough evidence to reject the null hypothesis in favor of the alternative hypothesis. The TI-84 Plus calculator can be used to calculate the P-value, which will help determine the statistical significance of the results.
For the group with bare metal stents:
n₁ = 5314 (total patients with bare metal stents)
X₁ = 832 (patients needing retreatment with bare metal stents)
p₁ = X₁ / n₁
For the group with drug-coated stents:
n₂ = 1119 (total patients with drug-coated stents)
X₂ = 140 (patients needing retreatment with drug-coated stents)
p₂ = X₂ / n₂
We can calculate the test statistic using the formula:
z = (p₁ - p₂) / sqrt(p(1 - p)(1/n₁ + 1/n₂))
where p = (X₁ + X₂) / (n₁ + n₂)
so the P-value is 0.151.
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The term that describes the concept that population will continue to grow even after fertility rates decline is known as?.
Answers
Future population growth or fall will be greatly influenced by how old the existing population is.
What is the role of population momentum?Population momentum happens because the number of women in reproductive age as well as the number of offspring per woman determine population increase.
To avoid the widespread fallacy that the only variables at play are fertility rate, death rate, and net migration, population momentum must be taken into consideration when predicting future demands.
Therefore, A population will continue to increase even if the fertility rate decreases, which is explained by population momentum.
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What is one event that may occur during Telophase I?
Answers
An event that may occur during Telophase I is: the nucleus of each cell may reappear as two independent cells are being formed.
Meiosis can be defined as a type of cell division or duplication that occurs in all body cells found in living organisms, through which a single cell divides twice to produce four (4) haploid cells (gamete).
Basically, deoxyribonucleic acid (DNA) must replicate before meiosis can occur in all body cells found in living organisms.
Generally, the phases or steps that occur during meiosis include:
Prophase I.Metaphase I.Anaphase I.Telophase I.Prophase II.Metaphase II.Anaphase II.Telophase II.Sometimes, the nucleus of a single cell may reappear when two (2) independent cells are being formed during Telophase I.
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A sample of human blood was placed in a test tube containing a
physiological saline solution (0.9% sodium chloride). This type of solution is
often used intravenously to quickly rehydrate patients. A drop of the blood
from the test tube was placed on a slide and red blood cells (RBCS) were
observed under a microscope. Three possible outcomes are diagrammed
below. Which of the following best predicts which diagrammed
microscope view the laboratory worker would see and best explains why?
View 1 because RBC membranes are freely permeable to water
View 2 because the RBCs use energy to allow sodium entry and to pump water out
View 2 because the rate of water movement into the RBCs equa's the rate of water
movement out of the cells
Vien 3 because the sodium-potassium pumps in the RBC membranes use energy to
Veep the codum out but a water to free to the des
Answers
Answer:
View 2
Explanation:
The rate of the water movement into the RBCs equals the rate of water movement out of the cells <3
The statement that best predicts diagrammed microscope view the laboratory worker would see is View 2. This is because the rate of water movement into the RBCs equals the rate of water movement out of the cells.
What is Microscope?A microscope may be defined as a type of laboratory instrument which is utilized to examine objects that are too small to be visualized by the unaided eye.
According to the context of this question, if a sample of human blood was functionally placed in a test tube containing a physiological saline solution.
This means that a concentration of salt is present in it. Due to this, the rate of migration of water into the RBCs is equal to the rate of water migration outside the cell. This is because the conditions are ideal for RBCs with respect to a specific cell.
Therefore, the correct option for this question is C.
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What happens to macromolecules from food during digestion?
What atoms make up sugar molecules, amino acids, and fatty acids?
What do you notice about the atoms that make up these molecules?
How are these atoms used to make new molecules? What types of molecules are
made?
Where does the energy come from to produce these new molecules?
If there is not enough carbohydrate intake, how does the body form glucose?
If there is a glucose shortage, how does the body produce energy?
Answers
Answer:
Explanation:
. Chemical digestion is the biochemical process in which macromolecules in food are changed into smaller molecules that can be absorbed into body fluids and transported to cells throughout the body. Substances in food that must be chemically digested include carbohydrates, proteins, lipids, and nucleic acids.
2.A fat molecule, such as a triglyceride, consists of two main components—glycerol and fatty acids. Glycerol is an organic compound with three carbon atoms, five hydrogen atoms, and three hydroxyl (–OH) groups.
3. If it's in the table, it's an element! Atoms can join together - they form bonds together - to make MOLECULES. For example, two atoms of hydrogen hook together to form a molecule of hydrogen, H2 for short.
4. When atoms join together to form molecules, they are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons between the atoms. It is only the electrons in the outermost shell that ever get involved in bonding.
A compound is a molecule made of atoms from different elements. There are two main types of chemical bonds that hold atoms together: covalent and ionic/electrovalent bonds. Atoms that share electrons in a chemical bond have covalent bonds. An oxygen molecule (O2) is a good example of a molecule with a covalent bond.
5.Beginning with energy sources obtained from their environment in the form of sunlight and organic food molecules, eukaryotic cells make energy-rich molecules like ATP and NADH via energy pathways including photosynthesis, glycolysis, the citric acid cycle, and oxidative phosphorylation.
Describe three adaptations
of exchange surfaces?
Answers
Answer:
large surface area, high concentration gradient to the substance and thin barriers to minimize diffusion distance
Explanation:
Select the correct location on the graph.
The graph shows the area of land deforested in a certain region each year from 1990 to 2004. Which bar on the graph corresponds to the year in
which human activity would have caused the greatest single-year change in biodiversity in the
region?
40,000
30,000
20,000
10,000
miles)
Area Deforested
(square
1990
1991
1992
1990
1991
1992
1993
1994
1996
1995
1997
1998
1999
Year
2001
2000
2002
2003
2004
Answers
Answer:
10,000
Explanation:
if something has a high kinetic energy, what would the temperature and
motion of molecules most likely be?
A. high temperature, slow motion of molecules
B. low temperature, fast motion of molecules
C. high temperature, fast motion of molecules
D. low temperature , slow motion of molecules
Answers
Elements that have the same number of protons but a different number of neutrons in the nucleus are called
A periods.
B metalloids.
C groups.
D isotopes.
Answers
They are atoms of an element with the normal number of protons and electrons but different number of protons and electrons
PLEASE HELP!!! (ANSWER APPROPRIATELY)
Answers
Answer:
With the boost in warmer weather and excess water, populations will boom
Explanation:
Yabbies will do best at a water temperature of between 12°C and 20°C but they will tolerate water that is a little colder or warmer. Complete immersion in water is not essential for life for the yabby. If its gills are kept moist (humid air is sufficient), it can absorb oxygen from the air and survive for many days out of water. To breed, however, it must be in water. With the water needed for breading and warmer weather used for breeding, population numbers for the Yabbies should rise.
The structure of a prokaryotic ribosome is not the same as a ribosome in an animal cell. As a result, which of the following is correct? (3 points)
Some antibiotics can block the synthesis of peptidoglycan in the walls of bacteria.
Translation can occur at the same time as transcription in eukaryotes but not in prokaryotes.
Some antibiotics can block protein synthesis in bacteria without harming the eukaryotic host.
Prokaryotes are unable to use a greater variety of molecules as food sources than can eukaryotes.
Answers
Answer:
Because the structure of a prokaryotic ribosome is not the same as that of a ribosome in an animal cell some antibiotics can block protein synthesis in bacteria without harming the eukaryotic host.
Explanation:
Antibiotics are medicines used to cure infectious diseases by killing bacteria or preventing their replication. One of the mechanisms of action of antibiotics is to act on ribosomes and inhibit protein synthesis.
The ribosomes of prokaryotic cells are 70S, with a ribosomal RNA (rRNA) content of 66-68%, while the ribosome of the animal cell has a sedimentation coefficient of 80S, with an rRNA percentage of 60%. This difference makes it possible for some antibiotics, such as aminoglycosides, to affect bacterial protein synthesis but not the animal cell's protein synthesis.
The other options are not related to the difference in ribosomes between prokaryotic cells and animal cells.
Answer:
Above is correct
Explanation:
Just took test
DNA is sometimes referred to as ?
Answers
Answer:
Its called the deoxyribonucleic acid or it can be referred to your double helix that your genes are made of or a MtDNA
Explanation:
Let me know if this helps
what energy-carrying molecule is created in this process?
Answers
Answer:
ATP is the energy-carrying molecule produced by the mitochondria through a series of chemical reactions.
Explanation:
In the 1960s, mitochondrial dna was discovered with the use of an electron microscope. the presence of mitochondrial dna in eukaryotic cells suggests what about the origin of life on earth?
Answers
It's possible that mitochondria were free-living cells (endosymbiotic theory).
What is the proof that mitochondria first appeared in eukaryotes?Mitochondria appear to have evolved only once throughout all of evolution, much like eukaryotes themselves. The mitochondrial DNA is conserved in all known eukaryotic groupings, which provides the strongest support for the idea that mitochondria had a single origin. These genes are definitely homologous and frequently inherited.
What does research on mitochondrial DNA indicate on the ancestry of contemporary Europeans?There was no genetic similarity between the hunter-gatherers and modern Europeans, according to a study of ancient and current mtDNA samples. This finding suggests that modern Europeans are descended from settlers who brought farming to the area, not from the indigenous populations.
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Help please I will mark brainlist!!
Answers
Answer: i think the answer c
Explanation:
on average, what percent of cardiac output do the kidneys receive?
Answers
On average, the kidneys receive approximately 20% of the cardiac output.
This means that every minute, approximately 1 liter of blood flows to the kidneys through the renal arteries. The kidneys require this large amount of blood flow to perform their vital functions of filtering and removing waste products from the body and regulating fluid and electrolyte balance.
The percentage of cardiac output received by the kidneys can vary based on factors such as blood pressure, hydration status, and overall health. For example, in cases of low blood pressure, the kidneys may receive a greater percentage of the cardiac output to help maintain adequate blood flow and perfusion to the organs.
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Blood supply to an arm is cut off. Blood in the arm is sampled after five minutes and analyzed. Which of the following would occur?
Answers
If blood supply to an arm is cut off, the arm would become ischemic, which means that there would be no blood flow to the tissues in the arm, which could lead to tissue damage or death and after five minutes, the blood in the arm would have decreased oxygen levels, increased carbon dioxide levels, increased acidity, and decreased pH.
The correct option to the given question is option d.
If blood supply to an arm is cut off, the arm would become ischemic. The absence of blood supply means that the cells in the arm would not receive oxygen or nutrients, which are essential for cell function and survival.
After five minutes, if blood in the arm is sampled and analyzed, the following changes would be observed:
Decreased oxygen levels: Since blood is not flowing to the arm, oxygen levels in the blood would decrease. This would lead to hypoxia, which is the condition of not having enough oxygen to meet the body's needs.
Increased carbon dioxide levels: As oxygen levels decrease, carbon dioxide levels in the blood would increase. Carbon dioxide is a waste product of cellular metabolism, and it is normally carried away by the blood to be exhaled by the lungs. If blood flow is cut off to the arm, carbon dioxide would build up in the tissues.
Increased acidity: When cells are deprived of oxygen, they switch to anaerobic metabolism, which produces lactic acid. The accumulation of lactic acid in the tissues would lead to an increase in acidity.
Decreased pH: As a result of the increased acidity, the pH of the blood would decrease. pH is a measure of how acidic or alkaline a substance is. A lower pH indicates higher acidity.thus, correct option is d.
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Help please please please
Answers
Hope this helps!