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Leto [7]
3 years ago
10

Which sample is a pure substance?

Biology
2 answers:
Flauer [41]3 years ago
6 0

Answer:

zinc oxide

Explanation:

dmitriy555 [2]3 years ago
3 0

Answer:

zinc oxide is a pure substance

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A dichotomous key is a tool created by scientists to help scientists and laypeople identify objects and organisms.

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Gaseous exchange is fundamental in aerobic organisms because oxygen is required to carry out cellular respiration.

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