A population of organisms that is reproductively isolated from other populations is considered a:
a. kingdom.
b. phylum.
c. genus.
d. species.
e. class.
D
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In the case of temperature regulation, an example of an effector is
a. a receptor in the brain. b. a center in the brain. c. a shivering skeletal muscle. d. none of the above.
Overgrazing in savannas by domestic animals has contributed to its conversion into:a
chaparral. b. grassland. c. desert. d. taiga. e. ecotones.
Which of the following would be an example of natural selection?
A. Mutations change the gene frequency of a population. B. All of the plants on an island are killed by a volcanic eruption. C. In a forest, the taller oak trees produce twice as many acorns as shorter ones. D. Mice that were painted with a white stripe by biologists were eaten by predators more often than those that were not painted.
A species is a group of organisms that
A. can produce fertile offspring when mated. B. all live in the same geographic region. C. always look the same in size and color. D. All of these answers are true.