The best evidence for the existence and movement of particles in liquids was provided by ______________.

John Dalton

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Thomas Edison

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J.J. Thomson

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Robert Brown

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Solution

The correct option is D Robert Brown
Robert brown observed a weak solution of milk and later pollen grains in suspension with a high-powered microscope, and saw that the particles of milk and the pollen grains showed a violent and random motion. This motion was named as Browninan motion.

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