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an educated explanation based on observations which can be tested

An explanation for some phenomenon based on an observation, experimentation, and reasoning

A group of organisms of the same species that live in a specific geographic area and interbreed

a change in the characteristics of a population from one generation to the next; the gradual development of organisms

a change in the nucleotide base sequence of a gene or dna molecule

An anatomical physiological behavioral change that improves a populations ability to survive

the fact or condition of occurring often

a readily available supply

the strength to stand or endure

relating to or causing death

no longer existing