I love to eat fruit, especially apples. Sometimes I have apple cores sitting out after I eat some. Why do the apple cores change color so quickly?
The apple core changes color due to oxidation, which is a chemical reaction with the air that causes the fruit to turn brown. This reaction is sped up by enzymes in the apple that break down certain compounds and create brown pigments.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:

I love to eat fruit, especially apples. Sometimes I have apple cores sitting out after I eat some. Why do the apple cores change color so quickly?

### Response:

The apple core changes color due to oxidation, which is a chemical reaction with the air that causes the fruit to turn brown. This reaction is sped up by enzymes in the apple that break down certain compounds and create brown pigments.
