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Inga [223]
4 years ago
10

When did the Phanerozoic eon begin?

Biology
2 answers:
Semenov [28]4 years ago
4 0

Answer:

Option C, About 540 million years ago

Explanation:

The Phanerozoic Eon  started from the end of Precambrian period and consists of three eras namely Paleozoic Era , the Mesozoic Era , and the  Cenozoic Era. It also consists of 12 geologic period. The Phanerozoic Eon is still continuing till today since it started some 540 -570 million years ago. It is this period which marks the evolution of complex lifeforms such as invertebrates ,some 500 million years ago.

Thus, option C is the appropriate answer.

Tom [10]4 years ago
3 0
It would be the second option about 540 million years ago.

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