The effect of movement of people between countries has effect on total world population. a. a damaging c. a great b. little d. no

C- A great effect

Explanation:

its correct. I took the test

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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.