How does the active site of an enzyme cause a high rate of reaction..

The active site of an enzyme causes a high rate of chemical reaction by: lowering the activation energy of the chemical reaction.

An enzyme can be defined as a biological catalyst that is typically used to speed up (increase) or catalyze (accelerate) the rate of a chemical reaction, especially by lowering (decreasing) the activation energy of its constituent chemical elements (reactants).

An active site is the functional region of an enzyme and it is usually made up of amino acids.

Generally, in order to speed up (increase) or catalyze (accelerate) the rate of a chemical reaction, over a short period of time, its activation energy chemical reaction should be lowered (decreased).

In conclusion, the active site of an enzyme causes a high rate of chemical reaction by lowering (decreasing) the activation energy of the chemical reaction.

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The active site of an enzyme would form enzyme-substrate complex thus lowering the activation energy of the reaction and high rate of reaction is found.

Explanation:

The energy required to start the reaction is activation energy. In our system enzymes catalyses the reaction by lowering the activation energy. When the substrate binds to the active site or catalytic site of enzyme, an enzyme-  substrate complex is formed. This complex reduces the time required  for substrate changing into product. The enzyme substrate complex results in the conformational changes and contributes in lowering of activation energy.

the fossil record provides evidence of a common ancestor to many species.