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Phytoplankton are only found at the surface of ocean waters because A. they feed on tiny organisms living at the surface. B. they are an important food source to surface-dwelling marine organisms. C. they require sunlight to carry out photosynthesis. D. they cannot withstand the colder temperatures of deep water.

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  1. wach
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    c. Phytoplankton require sunlight because they generate energy though photosynthesis. They do make tasty snacks for the passing aquatic organism, but not purposefully.

    • one year ago
  2. tsegaye
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    thanks Wach

    • one year ago
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