Eras are divided into_____.

Periods are divided into______________.

What is the name given to the earliest span of time in Earth's History?

What is the first era of geologic time?

What is the middle era?

What era do we currently live in?

What is the first period on the time scale?

What period do we currently live in?

What epoch do we currently live in?

Which era began with the invertebrates?

In which era were dinosaurs dominant?

When did small mammals and birds appear?

Flowering plants were the most common during what era?

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