iMyself wrote:
Most biologists agree that evolution takes place extremely slowly, with species requiring millions and millions of years to accumulate enough small changes to gradually transform
into new ones. For the first 4 billion years of Earth’s history, the only species known were bacteria, plankton, and algae. But the fossil record indicates that during a brief 30 million year span known as the Cambrian explosion, the eventual lineages of all major animal groups alive today appeared.
Which of the following,
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