Is a hamburger mixture or substance?

Here's why:

* Mixture: A mixture is a combination of two or more substances that are not chemically bonded. While a hamburger involves multiple ingredients, they are chemically combined during the cooking process.

* Substance: A substance is a pure form of matter with a definite chemical composition. While the hamburger is a complex combination of ingredients, it's a distinct entity once cooked.

Therefore, a hamburger is a substance, specifically a food item, that is created by combining various ingredients.