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As in the evolution of many things, there is usually one who is the "spark" to prepare the way. Zaccharias Janssen was just one of the many building blocks needed. Had he not been inquisitive and inventive, it would have been possibly a lot longer before scientists of the day put together the idea of placing more than one lens in a tube. His works sparked the curiosity of other men such as Galileo to add to and improve upon his own findings. So Janssen was not directly responsible for cell theories. However, others such as Robert Hooke would not have had the platform to work from to develop a cell theory.

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16y ago
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11y ago

He invented optical telescope which revolutionized cell theory.

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11y ago

Zacharias and Hans Janssen invented the world's first compound microscope in 1590.

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11y ago

Yes, they were inventors of the first compound microscope. This enabled people to observe cells.

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11y ago

Janssen was the first one to develop a "working" compound light microscope - in 1674, I think

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11y ago

bhoxs russel (bhoxs pakara sxingle llocah bebhe)

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11y ago

He and Zacharais Janssen discovered the first microscope basicly. It was really just eye-glasses

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12y ago

They created the compound microscope and invented the lenses use by leeuwenhoek. They helped make cells come alive as one of three inventors of the first modern microscope.

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11y ago

they gifted to to

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Q: What are Hans and Zacharias Janssen's contributions to cell theory?
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