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Answer:
C. He explained that pollen moves constantly because of "constant collision" by liquid
or
D. He explained that pollen moves constantly because of the "relative disturbance" by
other liquid particulates
The water molecules is hitting the pollen to move (i guess)
Explanation:
BASE ON MY RESEARCH:
In 1827, the English botanist Robert Brown noticed that
pollen seeds suspended in water moved in an irregular "swarming" motion.
Einstein then reasoned that if tiny but visible particles were suspended in a liquid, the invisible atoms in the liquid would bombard the suspended particles and cause them to jiggle.
Brownian motion is named after the botanist Robert Brown, who first observed this in 1827. He used a microscope to look at
pollen grains moving randomly in water
. ... But in 1905, physicist Albert Einstein explained that the pollen grains were being moved by individual water molecules.
The pollen grains move on the surface of water because they are constantly being hit by the fast moving particles of water
. So, though the water particles (or water molecules) are too small to be seen, but their effect on the pollen grains can be seen clearly.
Brownian motion is named after the botanist Robert Brown, who first observed this in 1827. He used a microscope to look at pollen grains moving randomly in water. ... But in 1905, physicist Albert Einstein explained that the
pollen grains were being moved by individual water molecules.
Brownian motion, also called Brownian movement,
any of various physical phenomena in which some quantity is constantly undergoing small, random fluctuations.
It was named for the Scottish botanist Robert Brown, the first to study such fluctuations (1827).
I got deep research to find the answer T-T I hope it helps if it is incorrect you may report my answer