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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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A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age.

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

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Camouflage is the use of any combination of materials, coloration, or illumination for concealment

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genetic variation means that biological systems – individuals and populations – are different over space. Each gene pool includes various alleles of genes.

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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 species is often defined as the largest group of organisms in which two individuals can produce fertile offspring, typically by sexual reproduction.

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Natural selection is the differential survival and reproduction of individuals due to differences in phenotype.

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Evolution is change in the heritable characteristics of biological populations over successive generations