Why do plants produce less oxygen during the night?
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a. photosynthesis only occurs at night.
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b. cellular respiration only occurs at night.
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c. cellular respiration stops at night.
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d. photosynthesis stops at night,

What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water