What happens to relative humidity of an unsaturated parcel of air when the temperature decreases?

Ineed , i need to create a power point in life science here is a picture explaining a little what the topic is about, me with some information for my slides : (

Altocumulus, altostratus, cirrocumuls, cirrostratus, cirrus, cumulonimbus, cumulus, nimbostratus, stratocumulus, stratus 8.) clouds with tallest vertical development 9.) low altitude clouds in solid layers that produce rain 10.) high altitude thin flat layers of clouds 11.) rain clouds that form under stable atmospheric conditions 12.) middle altitude clouds with globular appearance

Dan is an automobile engineer. he works for a well-known automobile firm. he used cae software to authorize a design before committing to making a physical prototype. which prototyping method did he use?