Summarize the functions of the nervous system. A. The nervous system controls the digestive system by sending signals to the stomach, telling it to contract and digest food.
B. The nervous system controls the respiratory system by sending signals to the muscles, telling them to flex and move limbs.
C. The nervous system controls the muscular system by sending signals to the blood, telling it to move throughout the body.
D. The nervous system controls the circulatory system by sending signals to the lungs, telling them to expand and inhale oxygen.

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.

geologic time scale (for gradpoint) =)