Here's why:

* Homogeneous mixture: A mixture where the components are evenly distributed throughout the mixture. You can't see individual parts.

* Heterogeneous mixture: A mixture where the components are not evenly distributed. You can see different parts.

Solutions are formed when one substance (solute) dissolves completely into another substance (solvent). This creates a uniform mixture where the solute particles are evenly distributed throughout the solvent. You can't distinguish the solute from the solvent visually.

Examples of solutions:

* Sugar dissolved in water

* Salt dissolved in water

* Air (gases dissolved in gases)

Let me know if you have more questions!