abril58
Answered

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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)

Sagot :

ayubkaziaddc

Answer:

. food in most ocean and

freshwater ecosystems

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