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

  • Option 1)

    Octopus

  • Option 2)

    Asterias

  • Option 3)

    Ascidia

  • Option 4)

    Fasciola

 

Answers (1)
V Vakul

 

Phylum Platyhelminthes (Flat Worms) -

Free living, commensal or parasite with dorsoventrally flattened body, bilaterally symmetrical, triploblastic and acoelomate.

- wherein

Eg. Taenia, Fasciola

 

 Fasclola (Platyhelminthea) has single opening for both ingestion and excretion


Option 1)

Octopus

This is incorrect option

Option 2)

Asterias

This is incorrect option

Option 3)

Ascidia

This is incorrect option

Option 4)

Fasciola

This is correct option

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