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Nitrogen is an important element in compound such as , DNA, & chlorophyll. Nitrogen is the most gas in the atmosphere. It cycles from the to & back to . But living things cannot use it in its gas form, therefore living things get from the . 1. Living organisms cannot use simple nitrogen molecules (NH2). 2. Living things take it in as a nitrate (NO3-). 3. Nitrate is formed when nitrogen is combined with oxygen. This process is called nitrogen .
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