Answer :

(a) Dust particles are moving in a haphazard manner.

(b) Air

(c) Brownian motion, it relates to movement of particles discovered by Robert Brown.

(d) The fast moving air molecules are constantly hitting the tiny dust particles causing them to move rapidly in a very haphazard manner

(f) The gaseous matter ‘air’ is made up of very tiny particles which are constantly moving.

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