A country's fertility rate suggests zero population growth, but it shows an increase of 20—30 percent over 50 years. What might account for this?

A) lower logistic growth
B) a larger proportion of post-reproductive females
C) better food availability
D) immigration
E) higher environmental resistance


Answer: D

Biology & Microbiology

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In plants, the sporophyte generation produces _______ as a result of meiosis.  

Fill in the blank(s) with the appropriate word(s).

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Which of the following is (are) NOT true concerning

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Reef systems

a. be all be destroyed within 30 years. b. are formed from calcium carbonate secreted by coral polyps. c. have symbiotic dinoflagellates in the living coral. d. have shown widespread bleaching; death of corals is being reported worldwide. e. include all of these.

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