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What causes infectious diseases in the human population? (1) allergic reactions (3) toxic chemicals (2) poor dietary habits (4) microorganism
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What causes infectious diseases in the human population?

(1) allergic reactions
(3) toxic chemicals
(2) poor dietary habits
(4) microorganism

User Searles
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Micro-organisms can spread to person to person
User Rixhers Ajazi
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