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refers to any variation in the nucleotides, genes, chromosomes, or whole genomes of organisms.
competition between organisms of different species.
a graphical representation of the evolutionary relationship between taxonomic groups based on...
the most common and most movable type of joint in the body of a mammal e.g. the elbow.
(also called caustic soda) a white solid, available in pellets, flakes or granules, with the...