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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. Octopus
2. Asterias
3. Ascidia
4. Fasciola

Correct answer: Fasciola

Solution

Fasciola is a trematode flatworm, and flatworms have an incomplete digestive system with a single opening that functions as both mouth and anus. The other options have separate openings or different body plans.

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