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Answer :

Answer:

2. phytoplankton

Explanation:

This is the answer because...phytoplankton is the main food of fish and without fish there could not be food for millions of people! 3 billion people eat seafood so it would be a big deal if seafood was no longer avialiable.

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I hope you like my explination.

Answer:

b thx for points<3

Explanation: