When substances combine to form mixtures they keep their properties.
O
True
O
False

True

Explanation:

This is true because When two or more elements or compounds are blended without combining chemically, you've got a mixture. Each substance in a mixture keeps its own properties, and mixtures can be separated using physical or mechanical means. Solids, liquids and gases can all be blended into mixtures.

a. a primary source combines several different accounts of an event. b. a primary source generally benefits from having been written after an event.

explanation:

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