Answer: Mammalia.
- A Aves
- B Reptilia
- C Mammalia
- D Amphibia
Correct answer: C. Mammalia
Explanation: Mammalia is characterized by mammary glands for nourishing young, hair on the skin, sweat and oil glands, and a four-chambered heart.
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.