NCERT Solutions of class 7th sub science ch 10 Respiration in Organisms
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Infectious diseases are transmitted from person-to-person through the transfer of a pathogen such as bacteria, viruses, fungi or parasites. A non-infectious disease cannot be transmitted through a pathogen and is caused by a variety of other circumstantial factors
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NCERT Solutions of class 7th sub science ch 10 Respiration in Organisms
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