Which of the following enter(s) mainly in the structure of the cell walls of cactus plant epidermis ? a- cellulose only
b-cellulose and cutin
c-cutin only
d-cellulose and lignin​

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.

b is the answer and if you need further with anything message me