Eras, like the Paleozoic, Mesozoic, and Cenozoic periods are separated into periods by which marker?

Question 4 options:

Changes in rock layers

Species extinction

100 million year chunks

The types of living organisms that were present

Question

Geography

Yair Best

25 October, 00:10

Eras, like the Paleozoic, Mesozoic, and Cenozoic periods are separated into periods by which marker?

Question 4 options:

Changes in rock layers

Species extinction

100 million year chunks

The types of living organisms that were present

+5

Answers (1)

Know the Answer?

Maurice Russell · Answer 1

Eras are divided according to mass extinction. More specifically, when a type of species was most prominent on land. For example, we are living in a mammal dominated era - the cenozoic.

Eras, like the Paleozoic, Mesozoic, and Cenozoic periods are separated into periods by which marker?Question 4 options:Changes in rock layersSpecies extinction100 million year chunksThe types of living organisms that were present

Eras, like the Paleozoic, Mesozoic, and Cenozoic periods are separated into periods by which marker?

Question 4 options:

Changes in rock layers

Species extinction

100 million year chunks

The types of living organisms that were present