Voyaging populations of hunter-gatherer Native Americans visited the Channel Islands and found tar balls on the beaches from the natural oil supplies. The tar balls could be used as a waterproofing material for small huts. The visitors also caught an abundance of fish and sheep and found several edible plants. Within 5 years, the Native American population exploded; they inhabited every island in the archipelago.

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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.

the answer would be d : p