B2-Fossils

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  • Created by: Heather
  • Created on: 09-05-14 21:42
What are fossils?
They are preserved remains or traces of dead organisms,
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Where are fossils found?
rocks
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What are the three ways fossils can be formed?
Hard body parts such as bones and shells don't decay as easily or are replaced by other materials as they decay, -Parts of organisms that haven't dcayed so reserved in tar pits, -Casts or imprints covered by layers of sediment,
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How do the position of fossils in rocks support the theory of evolution?
As fossils of the simplest organisms are found in the oldest rocks and fossils of more complex are found in newest rocks,
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Why are fossils useful for scientists?
It allows them to learn how much or little organisms have changed as life developed on Earth,
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What are the problems with the fossil records?
-Soft bodied early life forms have no/little traces as dont form fossils, -Rock cycle destroys traces,
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What are some factors that can cause speciation?
-New diseases, new predators, new more successful predators, single catastrophic event, climate change,
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What is an example of an extinct animal due to new competition?
Dodo
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How do new species arise due to isolation?
Species seperated to new environment-Already variation in the species and genetic variation occurs in some of the species caused by random mutation which gives them advantageous features, genetic varies until they are speciated-can't interbreed,
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Other cards in this set

Card 2

Front

Where are fossils found?

Back

rocks

Card 3

Front

What are the three ways fossils can be formed?

Back

Preview of the front of card 3

Card 4

Front

How do the position of fossils in rocks support the theory of evolution?

Back

Preview of the front of card 4

Card 5

Front

Why are fossils useful for scientists?

Back

Preview of the front of card 5
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