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.

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that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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the five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.