Which of the following is not a pure substance?

Examples of materials that are not pure substances include gravel, your computer, a mixture of salt and sugar, and a tree.

Explanation:

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1. is geographic distribution

2 is increasing complexity

3 is transitional forms

other quantities, called derived quantities, are defined in terms of the seven base quantities via a system of quantity equations. the si derived unitsfor these derived quantities are obtained from these equations and the seven si base units.