The upper part of sea water mainly contains

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(B) The upper layer of sea water,known as the photic zone,is rich in sunlight,which supports the growth of photosynthetic organisms. Planktons are org

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Planktons only

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(B) The upper layer of sea water,known as the photic zone,is rich in sunlight,which supports the growth of photosynthetic organisms. Planktons are organisms that drift or float passively with water currents. Because they rely on sunlight for photosynthesis or feed on other microscopic organisms in the upper layers,planktons are the primary inhabitants of the upper part of sea water. Nektons are active swimmers (like fish) that can move against currents,but the biomass of the upper layers is dominated by planktons.

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