Wouldn’t species always be evolving? Example: Why do we find a couple of dozen T-Rex skeletons and not all the evolving stages that lead to the T. Rex over millions of years? And are those specimens classified as different species?
It is actually very rare for something to fossilize. Even more rare for small animals to fossilize. The bones and impressions we do have are just a tiny window into the history of the earth. The farther back you go, the luckier you’ll be to find anything
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