Each species occupies a certain __________, characterized by physical and chemical features and by the array of other
species living in it. Fill in the blank(s) with the appropriate word(s).
ANSWER: niche
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The difference between intrapleural pressure and intra-alveolar pressure is
A) the driving force for air flow into and out of the lungs. B) zero. C) atmospheric pressure. D) approximately 100 mm Hg. E) transpulmonary pressure.
The respiratory center is very sensitive to changes in ________ levels, but not very sensitive to changes in ________ levels
A) blood sugar; hormone B) carbon dioxide; oxygen C) oxygen; carbon dioxide D) hormone; blood sugar E) temperature; blood pressure
________ is directional growth responses of plants to a unidirectional source of light.
A. Dormancy B. Phototropism C. Thermotropism D. Gravitropism E. Thigmotropism
Which best describes the effect of positive assortative mating in a population?
a. It causes natural selection. b. It increases homozygosity. c. It changes allele frequencies. d. It stabilizes genotype frequencies. e. It produces more mutations each generation