| Front | CO2 levels fluctuate |
|---|---|
| Back | CO2 levels fluctuate as photo only occurs in presence of light (daytime) so CO2 removed from atm only during day, respiro occurs throughout day/night, so CO2 released at relatively constant rate into atm, so CO2 levels higher at night than during day, CO2 levels in atm lower in summer than winter as photo rates faster |
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