What do fish eat?
scientific question
nonscientific question
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Actually Welcome to the Concept of the Biology.

Fish are basically Aquatic Animals, thus only are able to eat the Aquatic food.

Some of the food that fish eat are small fish, insects, larvae and crustaceans.

Also some times they eat Planktoons and aquatic plants like Porifera and etc.

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

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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.