Classification of Animals
Question
Which of the following has an incomplete alimentary canal?
Easy
Solution
The members of phylum Platyhelminthes (e.g., Planaria) have an incomplete alimentary canal with a single opening that serves as both mouth and anus.
Aschelminthes (e.g., Ascaris), annelids (e.g., Nereis) and arthropods (e.g., Locusta) have a complete alimentary canal with two openings, the mouth and the anus.
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