Coral reefs:
a. remove carbon dioxide from water and air
b. provide compounds used for pharmaceuticals.
c. provide protection from storm generated surf conditions.
d. all of these choices.
d
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Why is human population genetic variation lower than the level of variation seen in other species?
A. Humans have a smaller population size than any other species. B. Humans have a larger population size than any other species. C. Human ancestral lineages are relatively old compared to other species. D. Human ancestral lineages are relatively young compared to other species. E. Humans have a much lower genetic mutation rate. F. Humans have much higher rates of gene flow than other species. G. Humans have a much lower birth rate and reproductive success compared to other species.
Which of the zones of a lake supports detritivores and decomposers but no photosynthesizers?
a. zones A & B b. zones B & C c. zones C & A d. zones D & E e. zones A & D
The unifying theme in biology is
a. ecology b. genetics c. metabolism d. evolution e. taxonomy
Which of the following is an example of predation?
a) a mosquito feeds on the blood of a human b) a protist breaks down cellulose in the gut of a termite c) a remora hitches a ride on the fin of a shark d) a lion hunts and eats a zebra for food