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sergey [27]
3 years ago
11

What are the two classes of pure substances?

Biology
2 answers:
Viefleur [7K]3 years ago
8 0

Elements and compounds

Alenkinab [10]3 years ago
5 0

Answer:

Elements and compounds

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Both calcium and phosphorus are closely together to form strong bones. calcium needs phosphorus to maximize the bone strengthening.

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