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Biology — Nitrogen Cycle

Fixation, nitrification, assimilation and denitrification steps.

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digraph NitrogenCycle {
  rankdir=LR;
  node [shape=box, style=rounded];
  "N2 (atmosphere)" -> "Ammonia" [label="N-fixation"];
  "Ammonia" -> "Nitrites" [label="nitrification"];
  "Nitrites" -> "Nitrates" [label="nitrification"];
  "Nitrates" -> "Plants" [label="assimilation"];
  "Plants" -> "Animals" [label="feeding"];
  "Animals" -> "Ammonia" [label="decomposition"];
  "Nitrates" -> "N2 (atmosphere)" [label="denitrification"];
}