NAVTA Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Lice.

worm.

parasite.

Lice are classified as parasites because they depend on a host for survival and reproduction. They live on the skin or hair of their host and feed on blood, making them ectoparasites. This parasitic relationship can cause discomfort and various health issues for the host, such as itching and irritation. The other choices represent different types of organisms: worms are a separate category of parasites that live within the body; bacteria are single-celled microorganisms that can exist independently or as pathogens; and viruses are much smaller entities that require a host's cells to replicate. Thus, the definition of lice as parasites is most accurate in reflecting their biological characteristics and how they interact with their hosts.

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bacterium.

virus.

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