Dendrites:

a. conduct action potentials away from the cell body.

b. are present in mammalian nervous systems but not in the nervous systems of other vertebrates.

c. receive information from other neurons or from the external environment.

d. are coated in a fatty substance called the myelin sheath, which speeds up the rate at which signals are conducted.

e. are bundles of axons.

thinking it would be d not too sure but i think it's right

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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.