Which statements describe what happens when enzymes are added to a chemical reaction? Select all that apply.

- The chemical reaction is sped up.
- The chemical reaction is stopped.
- The activation energy is lowered.
- The enzymes are used up.

The chemical reaction is sped up.

The activation energy is lowered.

Explanation:

When enzymes are added to a chemical reaction, they lower the activation energy needed in the reaction.

In return, that also speeds up the chemical reaction, since less energy is needed to start it.

Enzymes do not stop chemical reactions, and enzymes can also be reused, so they are not used up.

So, the first and third statements are correct.

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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.