All the following factors affect the attenuation of light in water, except
A) phytoplankton.
B) water itself.
C) intensity of light.
D) dissolved substances.
D
Biology & Microbiology
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Breathing rate increases during exercise because
A. the heart is beating more rapidly. B. there is less oxygen in the blood. C. there is more carbon dioxide in the blood. D. there is an increase in blood pH.
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You observe that two sympatric species occupy different ecological niches. What kind of barrier originally caused their speciation?
A. prezygotic B. not enough information C. postzygotic
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Competition shapes communities because there are usually limited
A. nutrients. B. species. C. interactions. D. resources.
Biology & Microbiology