Question

During which geologic epoch do scientists infer

that the earliest grasses first appeared on Earth?
(1) Holocene
(2) Pleistocene
(3) Oligocene
(4) Eocene

Answer 1

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.

Answer 2

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.