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Q&A Can entirely physical digestion happen?

Writing a story in which most alien races digest food physically, not useing any chemical stuff. Is this even possible? I know that some lizards and chickens eat rocks for similar reasons, but they...

6 answers  ·  posted 8y ago by DomineSatanas‭  ·  last activity 8y ago by DomineSatanas‭

Question biology xenobiology