We are able to breathe because of the movement of a dome shaped muscle beneath the lungs called

relative humidity, temperature and dew point -- are bound together in the mathematical relationship below. relative humidity changes when temperatures change. because warm air can hold more water vapor than cool air, relative humidity falls when the temperature rises if no moisture is added to the air. so i would say a

wha is what i will use to get my free points

i thinking chemical change

yes, because even though a theory has a  lot of evidence to support it, it is not always true