The answer is d to the question!!!
Answer: c
Explanation: Plants and animals need nitrogen to make proteins but they cannot take it in from the air. Because nitrogen is unreactive as a gas, it has to be transformed into a new molecule. When bacteria in the soil takes nitrogen from the air, it becomes nitrates. Finally, it can move through the food chain in this form.
Thymine, Guamine, cytosine, and atanine make up the steps in dna (the nitrogenous bases) but the sided are a patter of phosphate then sugar.
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