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Similarities in the early development of chickens and opossums suggest that these organisms share a _________.

Niles Eldredge found evidence in trilobite fossils in a pattern of evolution in which short periods of long change are mixed in with longer periods of little or no change. This pattern is called _________.

A trilobite is considered an index fossil because this organism existed a limited period in Earth's history. That means any fossil located in layer of rock beneath trilobite fossil is ________ less than a trilobite.

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common ancestor
punctuated equilibrium
older
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