Hello, Last week our group did a project to see out of carbs, protein, and lipid which one produces the more carbon dioxide, and we were unsuccessful. Here is what we did: 4 test tubes 1 tube was control (4ml yeast and 10ml water) second tube (4ml yeast; 5ml water; 5ml lipid) third tube (4ml yeast; 5ml water; 5ml protein) fourth tube (4ml yeast; 5ml water; 5ml carbs) We put the balloons on the top of each test tube to see which one will expand more. Unfortunately, after 10 hours none of them produced the CO2. What could be the possible reason? We will have this project tomorrow again, so how should we design our project now? Thank you!