Why aren't ferns commonly found in deserts?
A. Ferns are nonvascular and cannot absorb water from deep within the soil.
B. Fern spores are unable to resist prolonged dry conditions.
C. Fern pollen is spread by insects that do not occur in deserts.
D. Fern fronds are sensitive to UV light.
Answer: B
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Speciation requires that two populations become ____ from each other
Fill in the blank with the appropriate word.
A rapidly growing population is indicated by
a. A. b. B. c. C. d. D. e. none of these.
Energy enters most ecosystems by the process of
A. biosynthesis. B. respiration. C. biogeochemical weathering. D. photosynthesis. E. fermentation.
According to the biological species concept, the evolution of reproductive barriers is the key to the origin of new species.
a. true b. false