Answer:
Each type of mineral has physical properties that differ from others. These properties include crystal structure, hardness, density, and color. For example, silver is a soft, shiny metal.
Explanation:
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Algae produces a estimated 30-50 percent of the net global oxygen .
The answer is not A because mutations can carry out bad genetic variations.
The answer is not B because mutations can carry out good genetic variations.
So, the answer is C because mutation is one of the key factors of genetic variation. (mutations can also have no affect)