invertebrate - an animal lacking a backbone, vertebrate - an animal that has a backbone, index fossils - a fossil of an animal or plant that existed during a specific period or environment in geological history, these are useful because it is easily identifiable, geographically widespread, abundant, and represents a limited range of time, fossil record - the information about Earth's history that can be gathered from fossils,

Fossils, Index Fossils, and Investigating Fossils

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