Why can only gases can be compressed?

Answer 1

The molecules in a gas are always spaced out in a random pattern and without strong forces of attraction that hold them together in an orderly arrangement unlike liquids where the molecules are closely packed but not in a orderly arrangement and they cannot move freely, however can still move around, due to the not very strong forces of attraction between them, and solids, where the molecules are closely packed into an orderly arrangement and they can only move around in their fixed positions, therefore gas molecules can move freely and can be compressed into the spaces between them.