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Protozoans consist primarily of eukaryotic and single-celled organisms. They are represented by four major groups namely Flagellates, Ciliates, Sarcodina, and Sporozoans.

Explanation:

plato users

given bodies of water

pacific / arctic / indian / southern

[ a ] the caribbean sea

[ b ] the northern ocean

[ c ] the atlantic ocean

[ d ] the barents sea

with this being the given answers

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".