Plankton and nekton are different because ____
a. plankton are pelagic
b. plankton are benthic
c. plankton float
d. nekton float
e. nekton are benthic
c
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Animal testing
A. extrapolates from low dose levels to high dose levels. B. extrapolates from test animals to humans. C. is noncontroversial. D. usually involves low dose levels. E. always involves high dose levels.
The depth of the crust does not depend on
A) the height of the mountain above it. B) the heights of nearby mountains. C) the density of the mantle beneath it. D) the composition of the crust.
Air performs ____ as a conductor of energy. Water performs ____ as a conductor of energy
A) well; well. B) poorly; poorly. C) well; poorly. D) poorly; well. E) well; not at all.
What is the greatest known cause of global amphibian declines?
A) pollution B) fires C) displacement by invasive species D) parasites and disease E) habitat loss