What is the human liver fluke dependent on to complete its life cycle?

What is the human liver fluke dependent on to complete its life cycle?
  1. One intermediate host
  2. Two intermediate hosts
  3. A vector
  4. A primary host

Solution

Darwin notes that the human liver fluke, a trematode parasite, depends on two intermediate hosts (a snail and a fish) to complete its life cycle.

Asked in: NCERT

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