How some cells know to be muscle and some know to be bone.

Their genetic code

Explanation:

Every cell is made with a genetic code that tells them what their jobs are in the cell, it is from when they are first formed, basically

it takes hundreds of years to become stable.

if you have another question lmk.

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.