The beginning of the "age of mammals" coincides with the beginning of this period,about 70 million years ago.
A)Tertiary
B)Triassic
C)Permian
D)Silurian
E)Devonian

Question

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The Tertiary period, which occurred from about 66 million to 2.6 million years ago, is often referred to as the beginning of the age of mammals. During this time, mammals diversified and underwent significant evolutionary changes, including the emergence of primates and the evolution of modern-day whales, dolphins, and bats.

The Beginning of the "Age of Mammals" Coincides with the Beginning