What are structures in cells that perform specific functions called?

the answer is "a.) well–developed vascular system."

explanation:

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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.

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it