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5.1 Part 1
fossils and evolution
5
Science
7th Grade
04/02/2011
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Term
fossils
 Definition
the physical remains of plants or animals preserved in rock or in the Earth's crust
Term
extinct
 Definition
when all the organisms of a species die
Term
evolution
 Definition
change over time
Term
theory of evolution
 Definition
all the changes that take place in a group of organisms over time and over many generations because of either mutations or natural selection or both
Term
ancestor
 Definition
species which share a common evolutionary relative
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