Temperature is perhaps the most important factor in the distribution of organisms because
A. water is more scarce in warmer environments.
B. wind amplifies the effect of cool temperatures.
C. most organisms are unable to regulate their body temperature precisely.
D. the metabolic optimum for endothermic animals is in temperate areas.
E. many organisms are able to grow faster in warmer climates.
Answer: C
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Legume plants with reduced amounts of leghemoglobin would be expected to:
A. be unable to form a nodule. B. fix more nitrogen than normal legume plants. C. fix less nitrogen than normal legume plants. D. be unable to form a symbiosis.
The fetal period is characterized by ________
A) the formation of organ systems B) neurulation C) germ layer formation D) growth and preparation of fetal organ systems for their eventual functions
Archaea and bacteria diverged:
a. about 3 billion years ago. b. about 100,000 millions years ago. c. about 1 billion years ago. d. about 2 billion years ago. e. about 10,000 million years ago.
The entire range of factors an organism has available to exploit in its habitat is its
A. expansion niche. B. fundamental niche. C. niche. D. realized niche.