The water particle are moving faster which cause the to expand
Well there's Water, Earth, Fire, and Air. Not quite sure how this would be a school question. But here it is.
Temporary changes would be weather, since it can change at any givin time another example would be tides coming in because they vary by day, or wet sand becoming dry sand!
Its helps pull apart the molecule water
to get the electrons from it
If you do not have variations to be selected by natural or sexual selection on their superior abilities to survive and reproduce successfully then nothing can be naturally selected against the immediate environment.
