Which combination of conditions would increase the rate of diffusion through a semipermeable membrane the most? I. steeper concentration gradients II. higher temperatures III. larger molecules
a. I only
b. II only
c. I and II
d. II and III
e. I, II, and III
c
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In early ancestors of the modern giraffe, longer necks allowed animals to reach higher tree branches as food. This would lead to ____ in the ancestral giraffe population.
A. disruptive selection B. directional selection C. sexual selection D. genetic drift E. stabilizing selection
In subarctic saltmarshes, the addition of phosphorus has no effect on productivity but additional nitrogen will increase productivity. In this example, nitrogen is a
A. stimulant of evapotranspiration. B. precursor to phosphorus. C. biomagnifying factor. D. limiting factor. E. lipid solvent.
What type of thinking is required?
What will be an ideal response?
Birds and mammals are considered polyphyletic when considering that
a. birds have wings and mammals do not. b. birds have feathers and mammals do not. c. birds and mammals do not share the same common reptilian ancestor. d. birds and mammals cannot interbreed. e. molecular clock data indicates birds and mammals diverged at the same time.