5. Pete is studying the factors that can affect cell respiration. Based on his research, he thinks that the amount of food and oxygen available will impact the rate of cell respiration. What should Pete do to
conduct a valid experiment that will test whether the amount of oxygen will affect the rate of cell
respiration?
a) Change the amount of food, keep the amount of oxygen and type of organism the same.
b) Change the type of organism and the amount of food at the same time while keeping the amount
of oxygen the same.
c) Change the amount of oxygen and keep the amount of food and type of organism the same.
d) Change the amount of oxygen and food while keeping the type of organism the same time.