this post was submitted on 20 Feb 2026
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Yeah it's an arbitrary line. Slow changes generation after generation, but where normally those changes balance out (a tall person is not much more likely to reproduce with tall people than short people), when a trait is advantageous/disadvantageous to survival or reproduction or encourages those with it to only reproduce with others with it sometimes it tilts the scales and slowly a proto deer/horse finds itself increasingly adapted to water to the point its leg bones become vestigial