Quote:
Originally Posted by Nereidalbel
Planets being habitable is not explained be panspermia; that's just being the right distance from the parent star. As for being able to eat plants on other worlds, that's just luck. Billions of years of evolution are more than enough to create large differences, as well as planets having differing chemical compositions.
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There are lots and lots of plants here on Earth that will kill you, quickly or slowly, if you eat them. In fact there are plants that have evolved chemical compositions specifically to make them toxic to plant-eaters; it's a common passive defense strategy.
Bill Stoddard