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OpenStudy (anonymous):

Which microscope did Anton van Leeuwenhoek use to observe single-celled organisms? A)simple microscope B)compound light microscope C)electron microscope D)tunneling microscope

OpenStudy (love_ranaa):

a) simple microscope :)

OpenStudy (anonymous):

why is this

OpenStudy (love_ranaa):

They were hand-made microscopes, and they were very basic.

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