Biology B2 - Recycling

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The element carbon is present in all living organisms. It is recycled through various processes, which are described in the carbon cycle.

Nitrogen is essential for the formation of amino acids to make proteins. The nitrogen cycle describes the ways in which nitrogen is recycled.

Nitrogen is essential for the formation of amino acids in proteins. The nitrogen cycle is a model that explains how nitrogen is recycled.

About 78% of the air is nitrogen. Because nitrogen is so unreactive, it cannot be used directly by plants to make protein. Nitrates…

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