In food webs, chain lengths
A. range between five and ten links.
B. have at least five links.
C. are usually two links.
D. are long and complex.
E. tend to be short.
Answer: E
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The persistence of the sickle-cell anemia allele in some African populations is the result of ____
a. a high rate of mutation of the normal allele to the sickle-cell anemia allele b. the advantage of the heterozygous form over the homozygous forms c. nonrandom mating d. a decline in the occurrence of malaria in Africa e. genetic drift
In highly integrated insect societies,
a. natural selection favors individual behaviors that lead to greater diversity among members of the society. b. there is scarcely any division of labor. c. cooperative behavior predominates. d. patterns of behavior are flexible, and learned behavior predominates. e. all of these are true
The term homoplasy is most applicable to which of the following features?
A) the legless condition found in various lineages of extant lizards B) the five-digit condition of human hands and bat wings C) the fur that covers Australian moles and North American moles D) the bones of bat forelimbs and the bones of bird forelimbs
In the Hardy-Weinberg Frequency p^2 represents __________.
a. homozygous dominant b. heterozygous c. homozygous recessive d. the entire population