If we can’t see air, can fish see water ?

The adaptive system plays a role here. Fish can’t see water because their optical speed of the velocity of what they see is limited. We as humans can’t see air because the air consists of particles that are to difficult for us to see with our evolved retinas to distinguish.

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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.