Two species of insects do not interbreed because their sexual organs will not fit together. This is an example of
A) allopatric speciation.
B) sympatric speciation.
C) a prezygotic reproductive barrier.
D) a postzygotic reproductive barrier.
C
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Although many processes are involved, clearly combustion of fossil fuels is the most important factor driving the global increase in atmospheric ________ and thus global warming
A) ozone B) CFCs C) nitrates D) oxygen E) CO2
Why are there multiple atmospheric cells as air moves from the equator to the poles instead of one single cell?
A) There are variations in the solar radiation. B) There are intermediate precipitation events which break up the air into circulation cells. C) There are variations in the speed of wind. D) The Coriolis effect breaks the air mass into atmospheric cells.
Describe what happens when species partition resources.
What will be an ideal response?
A steppe is a vast expanse of semiarid grassland.
a. true b. false