1. False
2. False
3. e. Marijuana
4. a. HIV
5. c. Pus
6. d. Antibodies
7. g. Alcohol
8. j. White blood cells
9. b. Lungs
10. h. Heart
11. A virus invades healthy cells and uses them to replicate, often destroying the host cell in the process. Bacteria are independent single-celled organisms that multiply outside of cells and can release toxins that damage tissues. While both can cause illness, viruses require a host cell to reproduce, whereas bacteria can grow and divide on their own.
Parent Tip: Review the logic above to help your child master the concept of immune system worksheet middle school.