Match the following list of animals with their level of organisation
A. Organ Level p. Pheretima
B. Cellular aggregate level q Fasciola
C . Tissue level r. Spongilla
D . Organ system level s. Obelia
A-s , B-r , C-p , D-q
A-s , B-q , C-r , D-p
A-q , B-s , C-r , D-p
A-q , B-r , C-s , D-p
Level of organization in animals -
Cellular levels (eg sponges)
Tissue level (eg coelenterates)
Organ level (Platyhelminthes)
Organ system (Aschelminthes to Chordates)