More than 70 percent of the grown in the united states is used to make food products for human consumption.

Wheat grown in the united states,    Americans constitute 5% of the world's population but consume 24% of the world's energy.  A farmer is growing wheat on rolling hills and specific area that have a variety of soil conditions and moisture.

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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.