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tendency toward perfection
Lamarck proposed that all organisms have an innate tendency toward complexity and perfection. As a result, they are continually changing and acquiring features that help them live more successfully in their environments.
differences among individuals of a species; results from mutation and sexual reproduction
helps to determine whether a fossil is older or younger than others by placing rock layers and their fossils in a temporal sequence
distinctive fossils used to establish and compare the relative ages of rock layers and fossils they contain
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