Which is a characteristic of mixtures? they are chemically bonded together.
they can be classified as pure substances.
they have fixed ratios between their components.
they can be separated by physical processes.

A characteristic of mixtures is they can be separated by physical processes.

Explanation:

This is because a mixture is a substance made up of two or more different substances which have been mixed together physically. If they can be physically combined, they can be physically separated.

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