The amount of water vapor present in the air is A water vapor

B humidity

C anemometer

D air pressure

humidity

Explanation:

The amount of water vapor in the air is called absolute humidity. The amount of water vapor in the air as compared with the amount of water that the air could hold is called relative humidity. This amount of space in air that can hold water changes depending on the temperature and pressure.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;