What is the leading cause for change between states of matter? motion, temperature change, breaking of intermolecular bonds, none of the above

I think the answer is temperature because take water ice and steam for example cold ice room temp water and super hot steam

This type of galaxy is an approximately ellipsoidal shape and a smooth, nearly featureless image. they are the largest single star systems, in the universe and are built by the collisions of many smaller galaxies.