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

Carbon, nitrogen and water are recycled trough ecosystems many times. Of all these nitrogen is eventually broken down completely.

Final Nitrogen

Explanation:

All carbon, nitrogen and water are recycled by the biosphere.

But all of these nitrogen is eventually broken down because there are three bonds are present in nitrogen and these bonds are stronger so cannot be easily broken down.

6.4 cm (max) - 25 cm (min)

the answer is minerals.