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Why are enzymes so important?
Because they act as a catalyst in the chemical reactions necessary for life within organisms.
Because they cause decomposition reactions.
Because they are the building blocks of proteins.
Because they are the building blocks of DNA and RNA.

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Sorbji
Because they act as a catalyst in the chemical reactions necessary for life within organisms. 

This is because without these enzymes that are speeding up the chemical reactions, we would not be able to live since they would take too long.

Answer: Option A

Explanation:

Enzymes are important because they act as catalyst in the chemical reaction that takes place inside the body.These reaction are important for the proper metabolism inside the body.

These substances does not takes part in the chemical reaction but reduces the energy required to initiate a reaction.

The enzyme is left in the same amount after the reaction and is used again the next chemical reaction.