Directional selection favors:
A. one narrow intermediate phenotype.
B. two otherwise maladapted phenotype.
C. one extreme phenotype.
D. two extreme phenotype
Answer: C. one extreme phenotype.
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Population growth typically slows down when populations reach carrying capacity because
A. resource limitation decreases birth rates. B. abundant resources reduce competition. C. density-independent mortality increases. D. predation pressure is reduced.
The thicker fur that is present in some animals in the population is an example of
a. an adaptation. b. evolution. c. natural selection. d. homology.
Normal bacterial flora are considered part of innate immunity because they produce:
a) antibodies b) bacteriocins c) cytokines d) histamine
The slow progression phase of an exercise program refers to the intensity and duration of workout that is maintained for life.
a. true b. false