Why can a liquid change to take the shape of its container but not expand to fill the container itself? a) because the particles of a liquid have a definite shape but no definite volume b) because the particles of a liquid are the result of both solid and gaseous phases combining c) because the particles of a liquid are held together loosely enough to flow, but not so loose that they expand d) because the particles of a liquid expend large amounts of energy in the flowing process and do not have any left to expand