Question

Mention different causes of diseases.

Subject - Biology
Chapter - Why Do We Fall ill ?
Class - 9th

Hint for the answer - Cause - immediate and contributing

Answer 1

nfectious diseases can be caused by:

Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis.Viruses. Even smaller than bacteria, viruses cause a multitude of diseases — ranging from the common cold to AIDS.

Hepatitis B. According to current statistics, hepatitis B is the most common infectious disease in the world, affecting some 2 billion people -- that's more than one-quarter of the world's population. ...