Biology - Old & new species

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What do fossils provide?
A record of organisms that lived a long time ago and evidence that animals and plants can change over long periods of time.
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What are fossils?
Preserved remains of traces of dead organisims, found in rocks.
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How are bones and shells preserved?
They are replaced by other materials as they decay.
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How are dead animals preserved?
In amber.
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How are casts and impressions such as foot prints preserved?
They are covered in layers of sediment which become rock.
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Which invidiuals are less likely to survive and reproduce?
Those that are poorly adapted to their environment.
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When this happens to a whole species, what is this called?
Extinction.
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What five factors can cause a species to become extinct?
New diseases, new predators, new/more successful competitors, changes in the environment over geological time and a single catastophic event.
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How do new species evolve as a result of isolation?
Two populations of a species become geographically seperated.
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What is this process called?
Specification.
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Other cards in this set

Card 2

Front

What are fossils?

Back

Preserved remains of traces of dead organisims, found in rocks.

Card 3

Front

How are bones and shells preserved?

Back

Preview of the front of card 3

Card 4

Front

How are dead animals preserved?

Back

Preview of the front of card 4

Card 5

Front

How are casts and impressions such as foot prints preserved?

Back

Preview of the front of card 5
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