State any one conditions for sickness, why we do fall sick?

When we come in contact with people who are sick.

The air carries bacteria, virus and the diseases that can be caused are: common cold, influenza, tuberculosis etc. (b) Through food and water: When one eats/drinks contaminated food/water, that contains bacteria, virus, worm etc. it can cause diseases like cholera typhoid, hepatitis.

Explanation:

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

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