Unfortunately, with dinosaurs, we haven't had enough specimens to determine how much variation there is within a species.
Sentiment: NEGATIVE
I think most of the dinosaur specimens we find represent subadult sizes.
Certainly paleontologists have found samples of an extremely small fraction, only, of the earth's extinct species, and even for groups that are most readily preserved and found as fossils they can never expect to find more than a fraction.
The evidence is overwhelming that birds are dinosaurs.
Evolutionary biologists are not content merely to explain how variation occurs within limits, however. They aspire to answer a much broader question-which is how complex organisms like birds, and flowers, and human beings came into existence in the first place.
Most people looking for dinosaurs are looking for beautiful skeletons.
There's no environment I can think of that would have remained constant enough to preserve dinosaur DNA.
Introspection and preserved writings give us far more insight into the ways of past humans than we have into the ways of past dinosaurs. For that reason, I'm optimistic that we can eventually arrive at convincing explanations for these broadest patterns of human history.
Every paleontologist knows that most new species, genera, and families, and that nearly all categories above the level of family appear in the record suddenly and are not led up to by known, gradual, completely continuous transitional sequences.
I encourage people who don't believe in evolution to look for horses in Jurassic Solenhofen limestone.
Indeed, I was unable to find any evidence whatsoever of the occurrence of a drastic evolutionary acceleration and genetic reconstruction in widespread, populous species.
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