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An infectious disease is one that is caused by

pollutants in the environment.

heredity.

pathogens.

hemophilia.

User StepUp
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2 Answers

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Pathogens because they help spread it to more than one person
User Flakx
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Answer:

pathogens

Step-by-step explanation:

pathogens may occur in various way e.g spread from a person to person by directly body contact

User Stevekohls
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