A student investigated respiration in yeast. They set up the experiment as shown in the diagram below.
Every 30 minutes they replaced the water with the same volume but it was 10 oC warmer and counted the bubbles given off in 2 minutes.Â
What are the independent and dependent variables in this experiment?
 | independent | dependent |
A | number of bubbles | time |
B | time | number of bubbles |
C | water temperature | number of bubbles |
D | water temperature | volume of water |
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