
Prompt
Create a fully labeled nitrogen cycle diagram on a white background with a pale sky band across the top labeled "Nitrogen gas in the atmosphere (N2) — 78% of the air". Below it draw a bean plant with visible root nodules on the left, a grazing cow on the right, and a soil cross-section beneath both. Draw eight thick curved arrows with short labels in white pills: "Biological nitrogen fixation — Rhizobium in root nodules" from atmospheric N2 down to a soil box reading "Ammonium (NH4+)"; a separate "Lightning fixation — nitrogen oxides carried by rain" arrow from atmospheric N2 down to a soil box reading "Nitrate (NO3-)"; "Nitrification step 1 — Nitrosomonas" from ammonium to a box reading "Nitrite (NO2-)"; "Nitrification step 2 — Nitrobacter" from nitrite to nitrate; "Assimilation" from nitrate up into the plant roots; "Feeding" from plant to cow; "Ammonification — decomposers" from dead matter and waste back to ammonium; and "Denitrification — Pseudomonas" running from nitrate up to atmospheric N2. Thin dark leader lines, readable sans-serif text. Never point the lightning arrow to ammonium.







