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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Every fossil we find is, in effect, a transitional fossil. Evolution takes such immense amounts of time that any changes in a particular generation or indeed multiple generations are likely to be so slight as to be very difficult to recognize.
Just consider the analogy of the creation of the Atlantic Ocean. The North American and European plates are moving apart by about 2.5cm each year. In a long human life your talking about maybe a 2 meter change. Well the Atlantic is around 4,800,000 meters wide. Over hundreds of millions of years you get movement over vast distances but any snapshot of time isn’t going to really show you anything. It’s the same principle with fossils.
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