Recently the United States and Canada have seen the development of West Nile virus. It is carried to humans by:
A) mosquitoes.
B) humans.
C) deer.
D) elk.
Ans: A
Feedback:
Parasites are multicellular organisms that live on other organisms without contributing anything to their hosts. Examples of parasites include protozoa, helminth, and arthropod species. Sexual contact, insects, and domestic animals frequently carry parasites to humans.
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