Biology - Lab Journal - Yeast Metabolism

We ran an experiment where we allowed yeast to consume sugar at 3 different temperatures: 25C, 30C, and 35C. We then measured the increase in CO2 over time because CO2 is a product of yeast metabolism. The three curves are shown below. 

Write a lab report with the follow components: 
1) Identify the question we are trying to answer using the format "Effect of X on Y." 
2) Identify the independent and dependent variables. 
3) Describe the results by comparing each of the three curves. 
4) Explain a reason for why the 25C and 30C curves come together at 70 minutes. 
5) Explain a reason for why the 35C curve has the steepest slope at the beginning. 
6) Explain a reason for why all three curves flatten over time.