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William Harvey theorized that humans and other mammals must reproduce through the joining of an egg and sperm. It took approximately 200 years until this theory could be confirmed by observation. It may seem very obvious to our eyes today, but..... Harvey lived from 1578-1657 and the first microscope was not invented until 1674

http://www.answers.com/William+Harvey

http://www.answers.com/topic/microscope-technology

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18y ago

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