Polymerase chain reaction (PCR) analysis is a technique used to replicate DNA. The process of PCR can create millions of copies of a small sample of DNA. Scientists can use PCR analysis to determine

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.

the answer is c. it will give up it's valence electron to the other atom.