Cellular respiration is
a spontaneous reaction that assembles smaller molecules into bigger molecules.
a spontaneous reaction that breaks down larger molecules into smaller molecules.
a nonspontaneous reaction that assembles smaller molecules into bigger molecules.
a nonspontaneous reaction that breaks down larger molecules into smaller molecules.

to translate the last persons comment: a nonspontaneous reaction that breaks down larger molecules into smaller molecules

Explanation:

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.