What are variables and controls?
3 types of variables: -Controlled -Independent -Dependent Controlled: the variable or the things you control e.g. the type of tooth brush used must be the same, the amount of water used to rinse, how long you brush your teeth for must be the same etc. Independent: The variable that you change e.g. the different type of staining foods and different type of non-staining foods. Dependent : The variable that you measured. This would be a little hard for you but some things that you may write is e.g. 30 ml of water used for each rinsing measured with a measuring cylinder. Good Luck!
