history of life on earth

List geological time divisions from longest to shortest .

When did the continents as we know them appear?

• they appear in Mesozoic time

• during the Mesozoic era, after Pangea split and continued to spread

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Why were there mass extinctions at the end of the Paleozoic era ?

• 70 percent of all land organisms become extinct

• the continental plates came together to form the large landmass pangaea

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What is the geological time scale based on ?

• the geologic time scale . is based on the appearance and disappearance of life forms

• the geological time scale is based on the disappearance and appearance of life forms

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Which era saw a mass extinction, probably caused in part by a meter or comet impact ?

• mass extinctions

• the Mesozoic era

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What era are we currently living in ?

• earth's history

• The Cenozoic era

Describe the earth's surface before the Mesozoic era

• it was covered in water

• it was a drought

What was the first organism to appear on earth?

how did it create energy ?

• cyanobacteria , it made energy through photosynthesis

• Paleozoic

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