Algal beds contribute very little to Earth's primary production because they
A) are limited by insufficient light.
B) are limited by oxygen depletion.
C) are limited by insufficient phosphorus.
D) are limited by insufficient nitrogen.
E) constitute a very small fraction of Earth's surface.
Correct Answer:
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Q17: Maintaining the capacity of ecosystems to provide
Q18: The hydrologic cycle is driven by
A) the
Q19: Carbon dioxide is called a greenhouse gas
Q20: Photosynthesis results in the fixation of
A) carbon.
B)
Q21: The layer of Earth's atmosphere that is
Q23: If the phenomenon of upwelling did not
Q24: If Earth had no atmosphere, the surface
Q25: The region of a lake in which
Q26: In which region of the ocean would
Q27: Low levels of net primary production would
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