How does balancing illustrate homeostasis

Balance is the indirect definition of homeostasis. When something in your body is out of balance, like say you have a high temperature, then you start to sweat to cool. This is an example of homeostasis. Any process that involves your body balancing some sort of level or temperature etc. is homeostasis.

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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.