Unit 1 Module 3 Evidence of Evolution

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Fossil Record

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Record of all the fossils ever discovered on Earth.

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Geologic Time Scale

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A chart that divides Earth’s history into different time units based on changes in the rocks and fossils.

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Extinction

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Event that occurs when the last individual organism of a species dies.

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Transitional Fossil

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A fossil that has characteristics of both ancestral organisms and organisms that evolved later.

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Comparative Anatomy

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The study of similarities and differences among structures of different species.

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Homologous Structures

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Body parts of organisms that are similar in structure and position but different in function.

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Analogous Structures

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Body parts that perform a similar function but differ in structure.

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Vestigial Structure

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Body part that has lost its original function through evolution.

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Embryology

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The science of the development of embryos from fertilization to birth.