Which organ is the site of gas exchange between the body and the environment?

The Lungs

Explanation:

The lungs and heart are the two organs that work with blood and air, but the lungs maintains the bond between the body and environment. It makes sure that your nose and mouth can take in air from the environment and THEN, to transfer the air from there to your lungs. This helps your body function. Hence, the answer is the lungs.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.