The ocean is composed of two regions:<br>1. Photozone: the depth at which sunlight can penetrate and be sufficient for photosynthesis (the depth of light transmission zone varies from sea area to sea area. The coastal area with extremely dirty water quality may be only a few meters, while the clear open water area may be as deep as 200 meters.)<br>2. No light zone: the water layer below the translucent zone, which is invisible all year round, accounts for more than 99% of the whole ocean.<br>
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