Which one of the following is an example of animals having a single opening, that serves both as mouth as well as anus?

Fasciola

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Octopus

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Asterias

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Ascidia

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Solution

The correct option is B Fasciola
Fasciola is a parasite belonging to the class of Platyhelminthes which infects the liver of mammals including human beings. It has a single opening as mouth and anus. It belongs to the class Trematoda. The single mouth leads to the blind gut.
So, the correct answer is option A.

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