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How many types of living things are are in the oceans, rivers, and tide pools?
Answer 1:

It is probable that most of the diversity of life lives in the oceans, which is some millions of species - we don't know exactly how many, and work is still being done to identify all of the species that do live in the ocean.

Rivers are considerably less diverse, but that isn't to say that the diversity there isn't too much to easily count either.



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