A model shows the visualize of what you need to do in order to complete the problem your asked. It can also show important steps and make it easier for you to answer the question, like length×height×width.
Answer:
1.

2.

5.

Step-by-step explanation:
It is correct on Edge!
Give thanks please!
It’s B because I got it right
c. the number of persons allegric to penicillin