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“... for evolutionary change comes from the sequence of fossils in layers of rocks. Eldredge and Tattersall point out that paleontologists may find nearly identical specimens separated by as much as five million years. Indeed some creatures, such as lung fishes, have hardly changed in 200 million years. This conservatism among some types is one of the ...”

“... backs? Were they, in the wildest theory, aquatic,* standing up to keep their noses above water? Ian Tattersall, of the Natural History Museum in New York, has a simpler story: ancestral great apes were vertical-bodied clamberers in trees; when they came down they had an almost equal chance of becoming quadrupeds or bipeds. The common thread in all of ...”