Homeostasis is the regulation of an organism’s internal environment to maintain conditions suitable for life. homeostasis requires

Homeostasis is the ability of an organism to adjust its internal environment to maintain a stable equilibrium. Homeostasis requires balances between many factors in the body such as the body temperature. Other factors include; fluid balance, blood sugar level, pH of extracellular fluid and the concentrations of sodium, potassium and calcium ions. These factors must be kept within specific pre-set limits in order to maintain the body's overall function.

Explanation:

Credit to this answer goes to @Bistai

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chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

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.