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morphology-based phylogeny
(lemmy.dbzer0.com)
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this post was submitted on 19 Oct 2025
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While a little arbitrary, we use "ability to produce viable offspring" as a metric of speciation. Two animals can bone and create an offspring, but that offspring has to have live gametes (egg/sperm) for the parents to be considered the same species.
it's not that arbitrary as you might think. genetics is literally all about mutating, mixing and recombining genes, and producing viable offspring together is a huge part of that. that is why the concept of species is so important.