Aristotle and Galen
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Aristotle, who lived from 384 BC to 322 BC, taught that the heart contained the intelligence. Except for a few guesses like this, he observed carefully. He described the habits and the bodily structure (anatomy) of many animals, birds and fish. Another Greek, Galen, who lived in the second century AD, performed biological experiments. Both careful observation of living things and experiments are used today in the study of biology. Galen observed and described the internal anatomy of the human body.-He described many parts that he saw in the body. But he was not always careful. He sometimes described what he expected to see and did not look carefully to see what was really there. For centuries after Galen, people studied anatomy from his books instead of trusting their own observations.
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