What is one characteristic of a sample of matter that indicates it is a pure substance? a. it can be separated using by a physical means, such as filtering. b. the components in a pure substance do not have to be in definite ratios. c. if the composition of a sample varies, the sample is a pure substance. d. if the composition of a sample is fixed, the sample is a pure substance?

The correct answer is option d.

Explanation:

Pure substance is defined as a matter with definite and constant composition.They following properties

The correct option in agree,net with above stated properties of pure substance is option d.

distance, luminosity, brightness, radius, chemical composition, and temperature

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

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