More cards in this set

Card 6

Front

what do hard parts of animals do?

Back

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Card 7

Front

Why do some organism not decay?

Back

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Card 8

Front

What happens to some parts of organisms?

Back

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Card 9

Front

What do some rock preserve?

Back

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Card 10

Front

Why do most organisms not leave a fossil?

Back

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Card 11

Front

What did many early life forms have? Which meant?

Back

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Card 12

Front

Why are traces likely to have been destroyed?

Back

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