what are defensive diseases? name one diseases and describe the reason of it.
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Diseases that occur due to lack of nutrients over a long period are called deficiency diseases or nutritional disease. Deficiency of one or more nutrients can cause diseases or disorders in our body. For example, wheat is rich in carbohydrates, but poor in nutrients like proteins and fats.
Disease and its causes
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.
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