Question

QUESTION 8

List the four eras on the geologic time scale. Describe one identifying type of organism from each era.

Answer 1

Fossil era and that’s all Ik

Answer 2

The fossil record is used to divide Earth's history into geologic time periods. The figure below shows the four major subdivisions of geologic time—eons, eras, periods, and epochs. Eons are the longest subdivision and are based on the abundance of certain fossils. Eons are divided into smaller time periods called eras