If baleen whales eat krill that eat diatoms, krill represents the ________ trophic level.
A. first
B. second
C. third
D. fourth
E. fifth
Answer: B
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Net energy is
a. the usable amount of low-quality energy from a given quantity of energy resource b. the total useful energy available from an energy resource c. analogous to total income d. the total useful energy from an energy resource minus the amount of energy used and wasted in producing it e. the amount of energy used and wasted to produce useful energy
The surface zone of the ocean
A) lies directly above the deep zone. B) is warmer in polar regions than in tropical regions. C) is a region of rapidly changing temperature. D) is well mixed by waves and currents. E) all of the above
What do closely spaced isobars on a map indicate?
a. strong pressure gradient b. northerly winds c. winds of low velocity d. weak breezes
The best dating method for a frozen mammoth carcass is rubidium 87-strontium 87. Indicate whether the statement is true or false