The main prey for the frogs in a certain pond are dragonflies. if the number of dragonflies is greatly reduced because of pesticide usage, how could the frogs adapt in order to survive?

Frogs would start eating some other kind of insect or else they would migrate to some other place.

Explanation: The population of frog is dependent on the dragonflies for their food and if the number of dragon flies are reduced due to the effect of pesticides then there are two options available for the frog.

First, the frogs can shift their preferences from dragon flies to some other insect.

Secondly, the frogs can migrate to some other place to fulfill the need of food.

equal distribution i think.

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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.