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?
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The fossil record only occurs if the ground is suitable to transforming creatures into fossils, which is quite rare. The vast majority of things that die will not fossilize, and the tiny minority that does is spread out over our entire planet and in many different rock layers. It is possible that we will fill in many of these gaps in the coming centuries, but even so, it’s likely that most gaps will remain. Likewise, many fossils that once were have likely been destroyed by compression or melting of the rock layers they were in.
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