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Carbon dioxide

Explanation:

The carbon combines with oxygen to form carbon dioxide (CO2) and is released back into the atmosphere as a waste product when animals breathe and exhale.

Carbon dioxide

Explanation:

When anything made out of carbon burns completely, the only end products are carbon dioxide and water vapor.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides