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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
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