Which of the following animals have a single opening that serves as both mouth and anus?
A
Fasciola
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B
Octopus
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C
Asterias
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D
Ascidia
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Solution
The correct option is D Fasciola Out
of the options given, Fasciola is the
animal with a single opening working as both mouth and anus. It is commonly
called liver fluke and is the largest fluke in the world. It is a trematode and
lacks an anus. It has a single mouth that leads to a blind gut.