A small population isolated at the edge of a species’ geographic distribution may experience ____ and genetic drift,
which may lead to the evolution of distinctive traits by ____.
a. population bottlenecks; artificial selection
b. a founder effect; natural selection
c. gene flow; natural selection
d. natural selection; population bottlenecks
e. population bottlenecks; founder effects
ANSWER: b
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The Heterophyes heterophyes worm, which has a genital sucker that surrounds the genital pore, has a variety of reservoir hosts including dogs, cats, and birds and a second intermediate host of freshwater:
a. snails. b. fish. c. crabs. d. shrimp.
Monosaccharides and amino acids enter brush border cells by ________
a. active transport b. simple diffusion c. facilitated diffusion through hydrophilic membrane tunnels d. emulsification by bile and diffusion across the plasma membrane
The boreal forest, or taiga, is characterized by which of the following dominant plants?
a. palms b. deciduous trees c. grasses d. conifers
According to the fossil record, the genus Homo first arose in
A) North America. B) Europe. C) Asia. D) Africa.