More than 7/8th or 87% of the history of the Earth makes up this division of time

The largest subdivision of geologic time is the

Dinosaurs were the dominant life form during this Era

The Cenozoic Era is also known as the Age of

Why didn't Trilobites lives during the Mesozoic Era?

Humans arrived during this most recent Era

During this Era fish and other soft bodied organisms lived in ancient seas for hundreds of millions of years

Which Era contains the Jurassic, Triassic and Cretaceous Periods?

During which time period did the continents form, life thrived as bacteria in the newly formed oceans, and the atmosphere began to fill with oxygen

Which Era ended with the greatest mass extinction in the history of Planet Earth, killing off nearly 95% of species?

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