Choose ALL the correct statements below:

- Ethanol is the solute in a mixture of 30% ethanol and 70% water.
- Homogenized milk is a colloid because of the protein and fat molecules that do not dissolve.
- Air is a solution. Since 78% of air is N₂, then N₂ is the solvent.
- Particle size is one thing that differentiates a solution, from a colloid, from a suspension.