The upper part of seawater mainly contains
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Planktons include all organisms that drift with the ocean currents. Both algae and bacteria are examples of planktons.
Nektons are all animals that are capable of swimming, such as fish, marine mammals and marine reptiles.
The upper zone of the ocean is called surface mixed zone and is created by warm temperatures and mixing of tides and currents. This zone contains both the nektons as well as the planktons
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