A.
B.
C.
D.
Astronomy.

c

Explanation:

Mercury has a very thin atmosphere. In fact, Mercury's atmosphere is so thin that is barely exists. The atmosphere is calculated as the thinnest atmosphere of all the planets in our Solar System.

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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.