Q: What are the two most common causes of diseases?


Read this paragraph and choose the correct option from the provided answers:

Today most people realize that microorganisms, such as bacteria or viruses, are the cause of disease. This concept is known as the germ theory of disease, one of the few scientific theories in the field of the life sciences. Although it seems obvious now, people did not always understand the cause of disease. How does a theory such as this become established?.

 Choices:

- bacteria and protazoa

- viruses and protazoa

- nutritional deficiencies

- bacteria and viruses


A:
bacteria and viruses