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Sagot :
The zig-zag movement of the pollen grain indicates the constant motion of water molecules.
Brownian motion refers to the random movement of small particles such as a pollen grain when suspended in water. This phenomenon was first observed by Robert Brown in 1827.
In his experiment, pollen grains were suspended in water and they were found to move in a zig-zag manner. This zig-zag movement of pollen grains meant that they are being bombarded by microscopic molecules of water which are in constant random motion according to theory.
Learn more: https://brainly.com/question/14021076
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