When he was just 22 years old, Darwin went on a scientific expedition aboard a ship called the

The ship Darwin traveled on was called the HMS Beagle. He traveled to Africa, South America, Australia, and Indonesia.

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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.