Is there a relationship between the predator and preys population? what is it?

The predators depend on the prey for food.

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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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.