What is infencious disease

Infectious diseases are disorders caused by organisms — such as bacteria, viruses, fungi or parasites. Many organisms live in and on our bodies. They're normally harmless or even helpful. But under certain conditions, some organisms may cause disease. Some infectious diseases can be passed from person to person.

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blue is scattered more than other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time.