Carbon into a leaf
Count the inventoryIncrease the account. Carbon on both sides increases together; sunlight contributes energy.
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FOLLOW MATTER THROUGH A SYSTEM
A living system rearranges matter and reuses working parts. Follow the carbon into a leaf, then the oxygen away from its carrier.
Increase the account. Carbon on both sides increases together; sunlight contributes energy.
Simplified coordination cartoon. The same Fe site is retained at every stage; O₂ movement is illustrative.
O₂ is associated with the represented heme site. Predict what will leave when oxygen is released.
FROM LIVING SYSTEMS TO INDUSTRY
Carry this distinction into ammonia production: the schematic iron catalyst stays separate from the nitrogen and hydrogen atoms accounted for in ammonia.
Inspect the iron catalystMAKE THE CONNECTION
Which account fits both living-system diagrams?