The study of how life originates and develops, or the process by which living organisms are generated and evolve.
From bio- (life) + -geny (from Greek -gonia, 'origin' or 'generation'). This is an older term for what modern scientists more commonly call biogenesis.
Biogeny is basically the old name for what we now call biogenesis—it's still used occasionally in older texts or in more philosophical discussions about the origin of life!
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