That era would be the <span>Pleistocene Epoch.</span>
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"B" P<span>unctuated equilibrium.
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But I would hardly call coelacanths "primitive" fishes though for more further information (That's another long story lol), but yeah, the Correct Answer in this case is 100% Option "B".
Hope this Helps! Have A Wonderful Day! :) :D
Answer:
I think the answer is likely A
RNA viruses can copy themselves which is harder for scientists to give an accurate conclusion to solve them.