What conditions must be present for air to sit over a location long enough to acquire the characteristics of the land or water beneath it? i need asap

Variety of living organisms; includes genetic, species, and ecological types.

Cells destroy body cells infected by a virus or bacteria. killer t t memory t none of the above

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). this change in skin color provides evidence that -