Biology, 04.10.2021 21:50, adeoluwa

18. Phytoplankton are important protists because
they are the initial source
of
a. food in most land
ecosystems.
b. food in most ocean and
freshwater ecosystems.
c. oxygen in the
atmosphere.
d. Both (a) and (b)

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18. Phytoplankton are important protists because
they are the initial source
of
...