* Mixture: A combination of two or more substances that are not chemically bonded. The substances in a mixture retain their individual properties.

* Element: A pure substance that cannot be broken down into simpler substances by chemical means (e.g., gold, oxygen, carbon).

* Compound: A substance formed when two or more elements are chemically combined in a fixed ratio (e.g., water, salt, carbon dioxide).

Here's how eggs fit into this:

* Egg yolk: Contains a mixture of fats, proteins, vitamins, minerals, and water.

* Egg white: Primarily composed of water and protein.

* Eggshell: Made of calcium carbonate, which is a compound.

Since eggs are made up of multiple components that are not chemically bonded, they qualify as a mixture.