Which of the following is true about mixtures and compounds? a. a mixture contains different substances that are not chemically combined with one another. b. mixtures and compounds are both made of two or more different substances. c. a compound forms when different substances chemically combine to form a new substance. d. all of these

D

Explanation:

All of these are true about mixtures and compounds.

Mixtures and compounds are both made of two or more different substances.

The key difference between mixtures and compounds is that a compound is a new substance that forms when other substances chemically combine. The new substance that is formed has different properties from the original substances.

A mixture is simply a physical combination of two or more substances. Some of the individual properties of the original substances are retained by the mixture.

Southern climates

Explanation:

Red hair population predominantly occur in Northern Climates. A clue that this is a favorable climate for this phenotype.