A) Coenozoic-Grasses and humans
B) Mesozoic -Cycads and dinosaurs
C) Palaeozoic-Prokaryotes and unicellular eukaryotes
D) Cambrian-Marine organism with external skeletons
Correct Answer: C
Solution :
Prokaryotes and unicellular eukaryotes were evolved during Archaeozoic and Proterozoic Eras (Precambrian time).
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