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One example of animals having a single opening to the outside that serves both as mouth as well as anus is:

  1. A
    Fasciola
  2. B
    Octopus
  3. C
    Asterias
  4. D
    Ascidia

Solution & Step-by-step Explanation

Fasciola (Liver fluke) belongs to Phylum Platyhelminthes. These animals have an incomplete digestive system with a single opening (blind sac body plan) that functions as both the mouth and the anus. The other organisms listed have complete digestive tracts with separate openings.

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One example of animals having a single opening to the outside that serves both as mouth as well as anus is:
A
Fasciola
B
Octopus
C
Asterias
D
Ascidia

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Animal KingdomPlatyhelminthesBody Plan

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