SCIENCE 55
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1.3.3 Lab: Investigate Cycling of O2 and CO2 
Dry Lab 
Environmental Science 
 
In this investigation, you will observe the release of O2 and CO2 into the environment. Gas 
production by two types of organisms will serve as evidence of photosynthesis and cellular 
respiration in action. In part 1, you will vary the amount of sugar present and observe the effect 
on cellular respiration. You will also observe how the rates of these processes vary as 
environmental conditions vary. In part 2, you ...
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