U9 LT #2 Evidence of Evolution

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Vestigial structures

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Remnants of once-important structures that have slowly lost all or most of their function.

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Homologous structures

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Structures with the same parts that have different functions, suggesting that organisms share a common ancestry.

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Embryology

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The study of embryos of various organisms to show a common ancestor because of similarities in development.

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Evolution

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The changes of species over time.

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Fossils

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Preserved remains of an organism that provide evidence of past life.

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Adaptive radiation

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The process by which organisms diversify rapidly into a variety of forms to adapt to different environments.

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Natural selection

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The process by which organisms better adapted to their environment tend to survive and produce more offspring.

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Speciation

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The formation of new and distinct species in the course of evolution.

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Mimicry

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The phenomenon where one species evolves to resemble another species for protection or other advantages.

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Common ancestry

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The concept that different species share a common ancestor from which they have evolved.