Pano makakatulong ang paglikha ng technology? ​

Ineed with these last two questions: 1) what are two types of cold air masses that influence the weather in north america? name them and describe their humidity. 2) describe the motion of a cold air mass and a warm air mass and the weather you would expect at a warm front and an occluded front.

Which accurately compares concave and convex lenses?

List and describe three ways that humans can change ecosystems and three ways that humans can protect ecosystems.