How will this mutation most likely affect the squirrel population?

If the trait is favorable, it will be passed on to offspring over many generations, resulting in a population of darker squirrels. This is how a mutation will most likely affect the squirrel population.

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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.