What two structures are not found in animal cells

Cell wall and chloroplasts, if you're comparing them to plant cells.

Explanation:

Plant cells have a harder protective wall around them, harder than the cell membrane. The animal cell doesn't have this.

Chloroplasts are organelles that takes the sunlight and turns it into energy for the plant cell. Animal cells don't have this for obvious reasons. We get our energy from food, not the sun.

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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.