How many atoms can a Carbon atom share?
A. One
B. Two
C. Three
D. Four
1
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D.4

Explanation:

It contains a carbon atom that bonds to six other atoms instead of the four we have been told carbon is limited to. Atoms form molecules by sharing electrons. Carbon has four electrons that it can share with other atoms

answer; i believe that the correct answer is (lung);

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.