Why liquid has no definite shape?

Why Amoeba has no definite shape?

(A) : Real expansion of liquid does not depend upon material of container ( R) : Liquids have no definite shape. They acquire the shape of their containers.

Why do solids have definite shapes ?

Why solids have definite shape and volume ?

A solid having no definite shape is called-

A solids having no definite shape is called :