Eras of Earth's History

Front

______ first appeared on Earth during the Triassic period.

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Dinosaurs

Front

Age of fish was during this era: Cenozoic, Mesozoic, Paleozoic

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Paleozoic

Front

Modern mammals was during this era: Cenozoic, Mesozoic, Paleozoic

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Cenozoic

Front

Age of reptiles was during this era: Cenozoic, Mesozoic, Paleozoic

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Mesozoic

Front

_____ were all extinct by the end of the Cretaceous period

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Dinosaurs

Front

______ have been on Earth for about 100,000 years. This is very short compared to how long dinosaurs lived on Earth.

Back

Humans

Front

The earliest part of Earth's history is called the: Cenozoic, Cambrian, Holocene, Precambrian

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Precambrian

Front

Which of these groups of animals appeared on Earth most recently? Reptiles, Amphibians, Mammals, Fish

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Mammals

Front

Trilobites serve as good _________ for various intervals of the Paleozoic era. This is because these species lived during a specific time span.

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Index fossil

Front

After Precambrian time, Earth's history is divided into three eras, beginning with the

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Paleozic Era