Moving toward the poles, climate becomes
A. warmer.
B. more tropical.
C. colder.
D. wetter.
Answer: C
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Adaptation in populations takes place in response to
A) anticipated future needs. B) selective pressures they have not yet experienced. C) only the selective pressures they currently experience. D) only selective pressures that favor survival.
________ is by some accounts the world's largest industry
Fill in the blank(s) with the appropriate word(s).
Biodiesel is often produced using
A) any type of cellulosic feedstock. B) corn-based ethanol. C) recycled vegetable oil used in cooking food. D) solar and wind turbine sources of energy.
The lithosphere
A. extends to an average depth of about 300 kilometers. B. is thickest under the continents, thinnest beneath the oceans. C. was discovered by studying the behavior of seismic waves generated by earthquakes. D. is partly molten and plastic in consistency.