Answer
a. Observation (O)
b. hypothesis ( H )
c. experiment ( E )
d. experiment ( E )
Work Step by Step
a. One hour after drinking a glass of regular milk, Jim experienced
stomach cramps
It is an observation of Jim.
b. Jim thinks he may be lactose intolerant
It is a hypothesis.
c. Jim drinks a glass of lactose-free milk and does not have any
stomach cramps
It is an experiment.
d. Jim drinks a glass of regular milk to which he has added
lactase, an enzyme that breaks down lactose, and has no
stomach cramps.
It is an experiment.
