Question

carbon, nitrogen, and water are recycled through ecosystems many times. which one of these eventually breaks down completely? carbon nitrogen water

Explanation:

Carbon and nitrogen are elements. Elements are fundamental substances that cannot be broken down into simpler substances by ordinary chemical means. Water (\(H_2O\)) is a compound made up of hydrogen and oxygen atoms. Compounds can be broken down into their constituent elements through chemical reactions (e.g., electrolysis of water: \(2H_2O\xrightarrow{electrolysis}2H_2 + O_2\)).

Answer:

water