Some facts about diseases are listed.
1 may be inherited from a parent
2 may be carried by a vector
3 may be caused by stress
4 may be passed on by contact
5 may enter through the mouth with food
Which numbered statements apply to infectious diseases?
1 )
1, 2 and 3
2 )
1, 3 and 5
3 )
2, 3 and 4
2, 4 and 5
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