Answer: Reptiles.
- A Only mammals
- B Reptiles
- C Birds only
- D No other group
Correct answer: B. Reptiles
Explanation: Fishes, amphibians and reptiles are cold-blooded (poikilothermic); only birds and mammals are warm-blooded.
Moving across the animal phyla, body organisation becomes progressively more complex: from no symmetry and cellular organisation (Porifera) through radial/diploblastic (Cnidaria), bilateral/acoelomate (Platyhelminthes), pseudocoelomate (Nematoda), to a true coelom with full organ systems (Annelida and beyond).
Concept context
Phylum-level classification of the animal kingdom from Porifera to Chordata, based on body symmetry, coelom, and segmentation. One of the most example-heavy chapters for NEET.