National parks are an important part of our heritage,
A. and they remain pristine and undisturbed because of their park status.
B. but they lack any protection from mining, logging, and grazing.
C. but they are endangered by overcrowding, pollution, and in some places, mining.
D. that unfortunately exist only in remote inaccessible areas.
E. but they are endangered by overcrowding.
Answer: C. but they are endangered by overcrowding, pollution, and in some places, mining.
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Which substance is not released by plant roots to enable and improve access to particular nutrients in the soil?
a. amino acids b. carbohydrates c. enzymes d. fatty acids e. carbon dioxide
In 1785, the theory of uniformitarianism was proposed by
A. James Hutton. B. Georges-Louis Buffon. C. Charles Darwin. D. Georges Cuvier. E. Charles Lyell.
Protein digestion begins in the
a. mouth. b. stomach. c. small intestine. d. large intestine. e. esophagus
In a Punnett square, the letters within the little boxes
represent a. offspring genotypes. b. parental genotypes. c. gametes. d. offspring phenotypes. e. parental phenotypes.