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A change or the process of change by which an organism or species becomes better suited to its environment.

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

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The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.

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The branch of biology and medicine concerned with the study of embryos and their development.

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The disguising of military personnel, equipment, and installations by painting or covering them to make them blend in with their surroundings.

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The occurrence of an organism in more than one distinct color or form.

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Reduction in the intensity of light or other radiation as it passes through a medium or object, due to absorption, reflection, and scattering.

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A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.

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

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The process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.