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Q&A Realism of this Respawning Creature

I am writing a story (well, developing one) in which a humanoid intelligently genetically engineered species is effectively immortal. The creature maintains its lifespan through a thick-shelled see...

2 answers  ·  posted 7y ago by asteal‭  ·  last activity 7y ago by asteal‭

Question biology reality-check evolution xenobiology