Which of the following is an example of an animal which has a single opening that serves as mouth as well as the anus?
A
Fasciola
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B
Octopoda
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C
Asterias
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D
Ascidia
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Solution
The correct option is AFasciola Some animals like Fasciola have a single opening which serves as both mouth and anus. Such animals are said to have an incomplete alimentary canal.