Câu hỏi:

19/04/2023 105

According to the passage, the numerical value of the concentration level of a substance is only useful if ______.

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Trả lời:

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Giải bởi Vietjack

As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil.

Chọn D

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