What causes the leaves on trees to change colour?
What causes the leaves on trees to change colour?

  • Change in Temperature (32%)
  • The Chlorophyll disappears (29%)
  • The leaves start to die (12%)
  • Someone coloured them with magic-marker (9%)
  • Not enough sunlight (8%)
  • Other - please discuss (3%)
  • It's time to harvest (3%)
  • Not enough light or water (2%)
  • Not enough water (1%)
Votes: 1366
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