Answer:
The correct description of a mixture is:
The particles do not retain their individual chemical properties, and they can only be separated by physical means.
In a mixture, different substances are combined physically, but they do not undergo any chemical bonding or reaction. The components of a mixture retain their individual physical and chemical properties. This means that the particles in a mixture can be separated by physical methods such as filtration, distillation, or evaporation, without undergoing any chemical changes.