B2 6.1: The origins of life on Earth.

All information was taken directly from the AQA revision guide with only the key points from B2 6.1.

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  • Created by: JSpencer
  • Created on: 29-02-16 13:33
How old is the earth believed to be?
4500 millon years old.
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How long ago is it believed life began?
3500 million years old.
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What is there debate about to do with life on earth?
whether first life developed due to Earths conditions or life form arrived from other plants.
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Where are fossils found?
In rocks.
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What can we tell about fossils?
The date so when different organisms lived.
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what do hard parts of animals do?
They do not decay as easily so will stay formed.
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Why do some organism not decay?
As the conditions are not right.
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What happens to some parts of organisms?
They are replaced by minerals as they decay.
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What do some rock preserve?
Traces of the organism e.g. footprints, burrows etc.
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Why do most organisms not leave a fossil?
As the exact conditions needed are not present.
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What did many early life forms have? Which meant?
Soft bodies so no trace is left.
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Why are traces likely to have been destroyed?
Due to geological activity such as earthquakes.
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Card 2

Front

How long ago is it believed life began?

Back

3500 million years old.

Card 3

Front

What is there debate about to do with life on earth?

Back

Preview of the front of card 3

Card 4

Front

Where are fossils found?

Back

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Card 5

Front

What can we tell about fossils?

Back

Preview of the front of card 5
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