Classification Without Fundamental Features — NEET Biology

Which of the following statements correctly describes the fundamental features of animal classification? S1. In diploblastic animals, an undifferentiated layer called mesoglea is present between the ectoderm and endoderm, as seen in Coelenterates. S2. Platyhelminthes exhibit organ level of organization, bilateral symmetry, and are acoelomate, lacking any body cavity. S3. Aschelminthes are pseudocoelomates with a complete digestive system and organ-system level of organization. S4. All coelomates, such as Annelids and Molluscs, possess a body cavity lined by mesoderm and invariably exhibit metameric segmentation. S5. Notochord is a mesodermally derived, rod-like structure present in all Chordates throughout their embryonic development, and in some, persists throughout life.