Were there any eukaryotic cells on Earth 1.5 billion years ago?
A) Yes,they first appear in the fossil record around 3.5 billion years ago.
B) Yes,they first appear in the fossil record around 2 billion years ago.
C) No,they do not appear in the fossil record until around 1 billion million years ago.
D) No,they do not appear in the fossil record until around 500 million years ago.
Correct Answer:
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