Question

When did the Phanerozoic eon begin

Answer 1

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The phanerozoic eon began about 542 million years ago.

Answer 2

but my choices are
2.0
20.5
540
10.1

Answer 3

Well which of them is the closest to 542?

Answer 4

540, thanks for the help

Answer 5

No problem \(\Huge\ddot\smile\)