Solution:
Fertilisation is external in Ctenoplana (Ctenophora).
Fertilisation is internal in Taenia (Platyhelminthes), Euspongia (Porifera) and Ascaris (Aschelminthes).
Fertilisation is external in
Fertilisation is external in Ctenoplana (Ctenophora).
Fertilisation is internal in Taenia (Platyhelminthes), Euspongia (Porifera) and Ascaris (Aschelminthes).