Verified Answer :

Grasses evolved around 40 million years go, that is in the Paleogene period.

Paleogene can be divided into Oligocene, Eocene and Paleocene.
40 Millions years ago falls into Eocene - this is the correct answer.

Grasses actually appeared rather late, and other plants, including ones with flowers appeared earlier.

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Answer:

Grasses evolved around 40 million years go, that is in the Paleogene period.

Paleogene can be divided into Oligocene, Eocene and Paleocene.

40 Millions years ago falls into Eocene - this is the correct answer.

Grasses actually appeared rather late, and other plants, including ones with flowers appeared earlier.

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