Define Brownian motion!

* In YOUR own words, n use it in a sentence, pretty please!

Brownian motion is the movement of small objects (such as sunflower seeds or dust particles) in a glass of water cuased by the random motion of atoms (or water moliceules).

Explanation:

A random movement of microscopic particles suspended in liquids or gases resulting from the impact of molecules of the surrounding medium .

— called also Brownian movement

The random movement of microscopic particles suspended in a liquid or gas , caused by collisions between these particles and the molecules of the liquid or gas. This movement is named for its identifier . Scottish botanist Robert Brown (1773-1858).

what subject is this

a- all cells come from pre-existing cells