Emma investigates the effect of different liquids on 1p coins, as shown in the table. Why does Emma not add any liquid to beaker 1? Beaker 1 2 3 4 Number of 1p coins 1 1 1 A to provide a control for the investigation B as a place for the 1p coins to dry after the investigation C as a way to measure the volumes of the liquids D to understand what happens to the 1p coins in a vacuum Liquid added no liquid lemonade bottled water salt water
