1. Which of the following is an observation? (A) The piece of metal is red, so it must be hot.
(B) He likes to run.
(C) The child's block is orange.
(D) The building looks like it must have fallen down

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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.