First slide

Basis of Classification

Question

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?

Easy

A

Flatworms
B

Roundworms
C

Glassworms
D

Earthworms

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.

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