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Q&A How do you explain a "brooder" sex evolutionarily?

I've seen several people independently come up with the idea of three or more sexes where one sex is responsible for brooding the young (pregnancy, pouch, feeding, something along those lines) but ...

3 answers  ·  posted 4y ago by Ettina Kitten‭  ·  last activity 4y ago by Ettina Kitten‭

Question biology evolution races fantasy-races xenobiology