A nonnative species accidentally introduced into Lake Erie, ____ inadvertently helped restore the polluted lake by eating phytoplankton.

a. mayflies
b. oligochaete worms
c. phytoplankton
d. salmon
e. zebra mussels


ANSWER: e

Biology & Microbiology

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A. infectious agents. B. eubacteria. C. archaebacteria. D. cellular agents.

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In the accompanying diagram, ____ is labeled "C"

a. the appendix b. the cecum c. a polyp d. a portion of the small intestine e. the colon

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Blood is delivered to each nephron by

a. an efferent arteriole. b. peritubular capillaries. c. a renal capsule. d. an afferent arteriole. e. proximal tubules.

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Low humidity in the atmosphere on a hot day ________.

A) helps in cooling because skin absorbs water from the atmosphere B) does not help in cooling because water evaporates from the skin faster C) helps in cooling because water evaporates from the skin faster D) does not help in cooling because skin absorbs water from the atmosphere

Biology & Microbiology