Could there be a planet somewhere with entirely vegetarian or even vegan life forms?
Would it be within the laws of physics etc for there to exist a planet where the life forms were entirely plant eaters? There would be no predators and everything would co-exist in harmony. I'm not looking for a religious angle on things - I would just like to know if such an ecology could actually work! We have always had a balance on this planet between meat eaters and plant eaters but could a planet's ecology work with plant eaters alone?
Back when Earth was dominated by single celled organisms, there was still biochemical warfare between them to kill each other to make room. When multi-celled organisms arose, you saw predators and parasites.
Even on a world where the size differential doesn't arise (all really small multi-celled organisms), you'd still get parasites.
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