The darker parts occur on the cooler parts of the cat's body because the enzyme that catalyzes the formation of the dark pigment is more active when cool. This example shows that enzymes are affected by .

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Answer:

The correct answer is - temperature.

Explanation:

These cats have an enzyme that acts on the body temperature of the body. Siamese cats are characterized by the dark and light regions on their fur. The dark region is present on the cooler side of the body of the cat due to the formation of dark pigment.

The dark pigment formation occurs due to the specific enzymes that are affected by the temperature because the pigment is active on the cool temperature in cats.

Thus, the correct answer is - temperature.  

Answer:

By temperature

Explanation:

Enzymes like proteins are affected by temperature change.