Students in a biology class thought that salt water would affect the movements of planaria.
They put 25 planaria in salt water and
recorded their observations.
Which flaw was present
in the design of their
experiment?

The answer to this will be from your lab notes/procedure. it would be best to ask another student who participated in the lab as we do not know what was done, what enzyme or if the temperature is celsius or fahrenheit. if i were to guess though i'd say the rate stopped due to enzyme denturing at high temperature