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There are some little reasons
that this happened, and there is one major gigantic
reason. The big cause is human; the spilling of oil,
trash, and pollutants in the ocean. It is called
polluting. Another reason is that the nutrients of
the sea get dissolved in the
 ocean water; as a
result plants inside sea do not have as much
nutrients available. One more motive is the boost in
temperature: a rise of 1.5°C since 1960 in some
oceans. Sea plants in underwater cannot live as long
as the water remains too warm thus the plants maybe
able to pass away.
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