Answer:
One sample should have had no enzyme and acted as a control.
Answer:
Yes.
Explanation:
They followed the concepts of replication and also had a control setup (the tap water one).
Answer:
C. Vaccination
Explanation:
vaccination is the administration of a vaccine to help the immune system develop protection from a disease. Vaccines contain a microorganism or virus in a weakened, live or killed state, or proteins or toxins from the organism.