Simple / Basic explanation to start study :

Nitrogen 78%
Oxygen 21%
Carbon Dioxide .03%

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N:::N > NH₃ NH₃

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NH₃ = Ammonia
NH₃ > NCC = Amino Acid

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NCC-NCC-NCC = Protein

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Photosynthesis makes Sugar
6 CH₂O + Oxygen / O₂

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Respiration
Sugar + Oxygen > CO₂ + 2 H₂O - metabolism

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DNA = A T C G
RNA = A U C G

When You See It, You are Getting It.