Anyone who has ever watched the monkeys and apes at a zoo couldn’t help but notice their resemblance to humans. By comparison, the bears in the zoo are not nearly as similar to humans as are the apes. Still, bears are warm-blooded mammals and thus are more similar to humans than are cold-blooded reptiles like the alligators. Alligators, however, do have legs and true lungs and thus are more similar to humans than are the fish. But even fish have bony vertebrae and thus are more similar to human than are the insects. And even insects are made up of many specialized cells and thus are more similar to humans than are the bacteria. Finally, all living things, including bacteria, have basically the same type of molecules that appear to be essential for life itself and share a common genetic code mechanism for their reproduction.
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