Q. Organ system level of organisation is observed in
A) Chordates
B) Annelids
C) Molluscs
D) All of these
Explanation
Organ system level of organisation is seen in chordates, annelids and mollusk. i.e., in all phyla from Platyhelminthes on wards
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.