Which biome is characterized by plants whose leaves drop off in the wintertime?
a. coniferous forest
b. tundra
c. temperate deciduous forest
d. tropical rain forest
e. boreal forest
c
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We can conclude that natural selection must have acted in favor of large brains in humans because:
A. we have large brains in proportion to our body size compared to other mammals. B. large brains have allowed us to dominate the planet. C. large brains are metabolically expensive to produce and maintain. D. we would not have large brains if natural selection did not favor them. E. None of the answer options are correct.
The eradication of malaria in Europe resulted from a specific breakthrough in the science of ____
a. systematics b. ecology c. morphology d. physiology e. sanitation
Cytotoxic T cells target
A) cancer cells and virally infected cells. B) skin cells and blood cells. C) bacterial cells and fungal cells. D) B cells and macrophages.
Which of the following is false concerning smooth
muscle cells? They a. do not have sarcomeres. b. contain a single nucleus. c. contain actin and myosin filaments. d. can sustain contractions longer than can striated muscle cells. e. have contractile units arranged in an orderly repeating fashion.