* Heterogeneous mixtures have components that are not evenly distributed and can be easily identified.

* Dough is made up of flour, water, yeast, and often other ingredients like sugar, salt, and fats. These components are not evenly mixed at a microscopic level. You can see the individual particles of flour and the air bubbles created by the yeast.

Examples of other heterogeneous mixtures:

* Salad

* Sand and water

* Oil and water

Homogeneous mixtures, in contrast, have components that are evenly distributed and cannot be easily identified. Examples include:

* Saltwater

* Air

* Sugar dissolved in water