People with emphysema often have a difficult time with air trapping, which is air left in the lungs following expiration, often due to the destruction of the alveoli. pulmonary rehabilitation educates people who suffer from this disease to use which muscles to air leave the lungs more effectively?

Diaphragm

Explanation:

it's unlikely a majority of a large population would agree on issues

hope this : )

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.