1. What is a disease?

2. Which of the following are disease-causing organisms called?

3. Fill in the blank: Diseases caused by pathogens are called ________ diseases.

4. Which of the following is NOT a communicable disease?

5. Non-communicable diseases are usually linked to ________, diet, and/or environment.

6. According to the diagram, which method is NOT a way diseases are transmitted?

7. Communicable diseases can spread from one person to another.

8. Which of the following is an example of a communicable disease?

9. What is the causal agent of Common cold and influenza?

10. Fill in the blank: The site of infection for Common cold and influenza is _________?