Fossils

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Define: Fossils
The preserved remains or traces of dead organisms which are found in rocks
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How can fossils be formed?
Hard body parts, Parts of animals that havent decayed and Casts or impressions
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Complete this sentence: fossils of the simplest organisms are....
Found in the oldest rocks
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Complete this sentence: Fossils of the complex organisms are...
Found in the newest rocks
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How does the fossil record support the theory of evolution?
The simplest life forms have gradually evolved into more complex ones
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How can scientists gain information from fossils?
They can learn how much or little different organisms have changed over time
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How can new species arise?
Isolation, Genetic Variation, Natural Selection and Speciation
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Define: Isolation
Two populations of a species become seperated e.g. geographically
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Define: Genetic Variation
Each population has a wide range of alleles that control their characteristics
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Define: Natural Selection
In each population, the alleles that control the characteristics which help the organisms to survive are selected
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Define: Speciation
The populations become so different that sucessful interbreeding is no longer possible
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Other cards in this set

Card 2

Front

How can fossils be formed?

Back

Hard body parts, Parts of animals that havent decayed and Casts or impressions

Card 3

Front

Complete this sentence: fossils of the simplest organisms are....

Back

Preview of the front of card 3

Card 4

Front

Complete this sentence: Fossils of the complex organisms are...

Back

Preview of the front of card 4

Card 5

Front

How does the fossil record support the theory of evolution?

Back

Preview of the front of card 5
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