A mixture which shows presence of uniform composition of solute particles into the solvent is known as a homogeneous mixture.
Distilled water is a clear solution in which there is uniform composition of solute particles into the solution.
Gasoline is mixture of different compounds which are evenly distributed. Therefore, it is also a homogeneous mixture.
Wine is also a clear solution in which particles are evenly distributed. Hence, it is a homogeneous mixture.
On the other hand, a mixture which shows non-uniform composition of solute particles into the solvent is known as a heterogeneous mixture.
Beach sand is a mixture of different particles present in varying composition. Hence, it is a heterogeneous mixture.
Also, in air there are different gases present in different composition. Mover over, there is presence of fog and smoke into the air. Hence, it is a heterogeneous mixture.
