Question

Trace elements are important chemicals for living organisms. They are called trace elements because...
A.They are present in very small quantities in the environment.
B.Their effects on human health are very small.
C.They are present in very small quantities in the body
D.They are used to "trace" pathways in the body using X-rays.

Answer 1

Answer:

✔Trace elements are important chemicals for living organisms. They are called trace elements because ------

(A) A.They are present in very small quantities in the environment.

Answer 2

The correct option is A.

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