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One common characteristics of solids, liquids and gasses ...

One common characteristics of solids, liquids and gasses is that?

A.

all the three has fixed volume

B.

their molecule have the same size

C.

their molecules are always in motion

D.

all the three have the same inter molecular forces

Correct answer is C

The kinetic theory of matter (particle theory) says that all matter consists of many, very small particles which are constantly moving or in a continual state of motion.