the decision

i have decided to do (with the help of my fellow classmate Mary and some research) How Much Longer Does It Take Bread with Preservatives to Grow Mold Than It Takes Bread without Preservatives?

The variables are:

• independent variable- the type of bread used (with and without preservatives)
• dependent variable- the time and how much mold grew
• controlled variable- the size of bread used -the storage of the bread slices -the environment where the bread are placed -results to be taken at the same time -the amount if light (heat) they reaceive
  

i think i can also create a valid and conclusive result from this