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What did he call the single-cell organisms he observed moving through his microscope

User Frits
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Answer:

What van Leeuwenhoek saw with these microscopes was bacteria and protozoa, but he called these tiny creatures “animalcules.” Van Leeuwenhoek became fascinated. He went on to be the first to observe and describe spermatozoa in 1677.

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User Loquace
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