Two species of closely related squirrels both
feed on acorns produced by oak trees. One
species feed exclusively near the top of the tree
and the other feeds exclusively towards the
bottom of the tree. This is an example of
a. competitive exclusion.
b. resource partitioning.
c. mutualism.
d. commensalism.
e. mimicry.
B
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The oldest fossils are typically found in the sediments ________.
A. located closest to the surface B. located close to water C. located close to human dwellings D. located deep under the surface
Which is incorrect about deuterostomes?
A. The blastopore becomes the animal's anus. B. The archenteron outpockets to form coelom. C. The commitment of embryonic cells to prescribed developmental pathways occurs later than in protostomes. D. Embryonic cells cleave in a spiral pattern. E. They are derived from the protostomes.
What happens to the pH of the bloodstream if a person hypoventilates?
Select one: a. The pH of the blood will become more acidic. b. The pH of the blood will increase. c. The pH of the blood will initially increase and then dramatically decrease. d. The pH of the blood will initially decrease and then dramatically increase. e. Nothing will happen to the pH of the blood. a
Plant cells can communicate with each other using what structure?