Question

Why do we fall I'll? ​

Answer 1

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It may be caused due to the attack of pathogens (virus, bacteria), lack of nutritious diet/balanced diet and lack of public health services. The disease which lasts for only a short period of time is called Acute Disease. For example: Influenza (Flu), Common cold, etc. For example: TB, Cancer, etc.

Answer 2

Answer:

due to entry of any pathogen , against which the antibodies are not produced by our immune system.

hope to be helpful