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

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Natural selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution

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Species is a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding. The species is the principal natural taxonomic unit, ranking below a genus and denoted by a Latin binomial, e.g., Homo sapiens.

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In biology and ecology, extinction is the termination of an organism or of a group of organisms, normally a species

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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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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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Embryology is the branch of biology that studies the prenatal development of gametes, fertilization, and development of embryos and fetuses.

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A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, hair, petrified wood, oil, coal, and DNA remnants. Wikipedia

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Speciation is the evolutionary process by which populations evolve to become distinct species. The biologist Orator F. Cook coined the term in 1906 for cladogenesis, the splitting of lineages, as opposed ... Wikipedia

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the action or process of adapting or being adapted.