For science we have just been working on an experiment involving Micro Organisms. We had three bottles, Bottle 1: Hot water, Bottle 2: Warm water and Bottle 3: Cold water. We put half a tsp of Yeast and a quarter of a tsp of Sugar the size and shape of the bottles were the same but the point of the experiment was to see which temprerature the yeast is most active at.
ps. I predicted that Warm water would work best.