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12.Ecosystem
normal

The upper part of sea water mainly contains

A

Nektons only

B

Planktons only

C

Nektons and planktons both

D

None of the above

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Solution

(b)Plankton's are passively drifting or floating organisms. Most of these minute organisms, plankton includes photosynthesizing organisms as well as heterotrophic organisms.

Standard 12
Biology
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