Final answer:
A solution is a homogeneous mixture of particles that are so small they can't be seen and won't settle to the bottom of the container.
Step-by-step explanation:
A homogeneous mixture of particles so small they can't be seen and won't settle to the bottom of the container is called a solution. Examples of solutions include saltwater, air, and simple syrup. In a solution, the particles are molecules or ions, and the mixture appears clear and transparent.