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What were the first organisms that appeared on the planet?
Shapiro's Variation
A theoretical concept or model in genetics which suggests variations in genetic transcription and translation processes.
Species Concept
A set of principles used to define what constitutes a species, involving criteria like reproductive isolation and genetic similarity.
Reproductive Isolation
A set of mechanisms or barriers that prevents different species from interbreeding, leading to the formation of new species.
Biological Species Concept
A definition of species according to which a species is a group of interbreeding natural populations that are reproductively isolated from other such groups.
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