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the action or process of adapting or being adapted.

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1. 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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1. 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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Variation, in biology, any difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences (genotypic variation) or by the effect of environmental factors on the expression of the genetic potentials (phenotypic variation).

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In biology and ecology, extinction is the termination of an organism or of a group of organisms (taxon), normally a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point.

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Exploring the latest in scientific discoveries from prehistoric life to missions to Mars.

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species. 1. Biology A group of closely related organisms that are very similar to each other and are usually capable of interbreeding and producing fertile offspring. The species is the fundamental category of taxonomic classification, ranking below a genus or subgenus.

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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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Evolution is change in the heritable characteristics of biological populations over successive generations.Evolutionary processes give rise to biodiversity at every level of biological organisation, including the levels of species, individual organisms, and molecules.