"What Is Meant By Trace Gases?", A. They Are Not Harmful, B. They Are Emitted By Trees, C. They Are Naturally Occuring On Earth, D. They Are Present I

What is meant by trace gases?

a. They are not harmful
b. They are emitted by trees
c. They are naturally occuring on Earth
d. They are present in very small amounts.

 

Answer:

d. they are present in very small amounts.

Explanation:

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