12. Why do the properties of a mixture vary?

According to research: "They mix in mixture vary because the composition of the mixture is not fixed." A mixture is a material system made up of two or more different substances which are mixed but are not combined chemically. A mixture refers to the physical combination of two or more substances on which the identities are retained and are mixed in the form of solutions, suspensions, and colloids. The properties of a mixture can vary, because the composition of a mixture is not fixed. If amount one of substance in mixture is changed, the properties such system is also changed. Please mark as brainliest.

Hope this helps :)

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.