One study has shown that when more lions join a hunting group, _____.
A. the success rate per lion falls
B. the success rate per lion remains proportional
C. the success rate per lion increases
D. the success rate per kion is the same but there is more food on average
E. more eventually drop out to be in isolation
Answer: A
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In sickle cell anemia, affected individuals carry ____
a. one of several different nucleotide substitutions b. the same single nucleotide substitution c. more than one nucleotide substitution d. a number of mutant alleles e. one mutant allele in several genes
Select all of the following ways that the flu virus may impact body systems.A) The breakdown of muscle fibers and accumulation of fluid cause muscle and joint achiness.B) The restriction of blood vessels in the skin conserves heat and results in chills.C) The abundance of cytokines signals the hypothalamus to increase body temperature, resulting in a fever.D) Appetite centers in the brain show reduced action, resulting in a loss of appetite and nausea.E) Toxins produced by the virus break down muscles, resulting in muscle aches and pains.F) A rapid loss of epithelial cells within the respiratory system results in a shortness of breath and rapid heart rate.
What will be an ideal response?
Sea snakes, which are reptiles, are similar in body form to eels, which are fish. Sea snakes and eels
therefore demonstrate. a. ancestral traits b. divergent evolution c. homologous traits d. reversal e. convergent evolution
Which of the following is considered a likely explanation for the events of the Cambrian explosion?
A) Complex predator-prey relationships and increased atmospheric oxygen levels promoted animal diversification. B) A great surge of volcanic activity was triggered by significant movements of the continental plates and possibly by an asteroid impact. C) Solar flares led to increased UV radiation intensity, which in turn promoted a high rate of mutation. This led to rapid diversification of animals. D) The massive growth of swamp vegetation depleted the atmosphere's carbon dioxide and eventually cooled the Earth's climate.