In which of the following members, the digestive system has only single opening to the outside of the body that serves as both mouth and anus?
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a
Flatworms
b
Roundworms
c
Glassworms
d
Earthworms
answer is A.
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Detailed Solution
In flatworms (Platyhelminthes), the digestive system has a single opening that serves as both mouth and anus. Glassworm is the larva of an insect named Chaoborus.