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All of the following must remain unchanged during data collection EXCEPT:

All of the following must remain unchanged during data collection EXCEPT: Correct Answer the amount of oxygen in the animal chamber

D. In this experiment, time is an independent variable and respiratory rate is the dependent variable. Temperature is also an independent variable, but this variable was assigned two values (10°C and 25°C) for the purpose of examining how temperature affects respiratory rate over time. But within each chamber, the temperature must be constant (either 10°C or 25°C). Only time and respiratory rate are allowed to vary. Since respiratory rate is indirectly measured by changes in the quantity of oxygen consumed, the amount of oxygen in each chamber is allowed to change. Note that KOH was added to the animal chambers to absorb any CO2 produced, thus maintaining a constant amount of CO2 in the chambers.

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