What is natural selection? a. a process that selects variations that with survival and that spreads the variations to more offspring b. a process through which nature selects an individual within a population for extinction c. the difference in heritable traits within a population d. the process of nature that causes random variations to appear in the offspring of every generation

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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.