Which statement correctly describes infectious diseases?
1 )
They are diseases caused by environmental factors that are not passed from one person to another.
2 )
They are diseases caused by a fault in the DNA that can be passed from a parent to their offspring.
3 )
They are diseases caused by a lack of a nutrient in the diet, such as a vitamin or mineral.
They are diseases caused by a pathogen such as a bacterium, fungus, protoctist or virus.
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