Evidence
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What it tells us:
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Past Lives
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1. growth rings in fossil trees or shells
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Growth rings tell us the number of years that individual lived.
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2. curled up fossil trilobites
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3. the contents of fossil nests
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4. fossils of many individuals of the same species together
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5. a change in the shape of a feature over time
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Geologic Time
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1. layers in the rocks
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2. index fossils
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3. fossil shells on mountain tops
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4. identical fossils on widely separated continents
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Paleoecology
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1. fossil marine animals in the desert
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2. shapes of leaf edges
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3. tooth marks in fossil shells
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4. fossil pollen
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Biodiversity
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1. fossils of organisms no longer alive today
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2. features that are shared by more than one species
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3. the extinction of many fossil species at the same time
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4. the extinction of one group of organism, like corals, on which other organisms depend
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