Oddly enough, my 5 year old kid asked me this question, so I wanted to make sure he got a proper answer.
In: Biology
Depending on the quality of the fossilization, you’ll get extremely microscopic details preserved that really look like cellular structures. Also, bones often have extremely complex 3d contours that are very consistent between members of a species. In both cases, and probably for a hundred other examples people can give, it’s technically possible for these shapes to occur coincidentally, but the chance is so low that we really don’t have to worry about it.
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