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What are the three vertical zone of a ma...

What are the three vertical zone of a marine ecosystem.

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(i) Euphotic zone upto a depth of 200 metres and is lighted zone. (ii) Aphotic zone from 200-2000 metres and with less light so no photosynthesis. (iii) Abyssal zone present below 2000 meter and is totally absence of light so no producer in this zone.
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