Canal System (Porifera)
Distinguishing feature of Sponges is the perforation of body surface by numerous apertures for ingress and egress of water current.Water current flows through a certain system of spaces collectively forming…
Zoology for UPSC and State PSC exams
Distinguishing feature of Sponges is the perforation of body surface by numerous apertures for ingress and egress of water current.Water current flows through a certain system of spaces collectively forming…