Concept:The kinetic molecular theory explains the physical properties of substances in terms of the constant random motion of their particles.
Explanation:In a liquid, molecules are in constant random motion and can slide past one another freely.
Because of this motion, the molecules do not settle into a fixed pattern or regular arrangement.
As a result, a liquid cannot hold a definite shape of its own and takes the shape of the container it is placed in.
Solidification, constant volume, and incompressibility depend more on intermolecular forces and particle spacing than on random molecular motion.
Therefore, the idea of constant random motion best explains why liquids have no characteristic shape.
Answer:D. have no characteristic shape