Water, air, and glasses are examples of

the water cycle

Explanation: Water is the liquid state and the most known states of water. Gas is water vapor and the humidity that you feel of a hot humid day. ice is the solid state of water. Not sure if you meant ice instead of gasses?

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?