a. louse.
b. virus.
c. protist.
d. bacterium.
The answer is D i just took the test and got it right!
Answer:
its not D
Explanation:
b. chemotherapy.
c. radiation therapy.
d. combination drug therapy.
B: grow germs in a lab culture
C: inject germs into a healthy animal
D: watch to determine how long it takes for the healthy animal to become ill