Q. One example of animals having a single opening to the outside that serves both as mouth as well as anus is

A) Fasciola
B) Octopus
C) Asterias
D) Ascidia
Explanation

[Solution from source] Platyhelminthes such as the liver fluke Fasciola have an incomplete digestive system, with one opening that works as both mouth and anus. Molluscs (Octopus), echinoderms (Asterias) and urochordates (Ascidia) have a complete gut with a separate mouth and anus. Answer (1).

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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