Answer: Option A
:
A
Reptiles generally have a three chambered heart, except a few groups such as crocodiles, which have a four chambered heart. Sea urchin is an echinoderm, and does not have parapodia. Parapodia are locomotory organs found in invertebrates such as annelids (e.g., Nereis). Obeliais a cnidarian that exhibits metagenesis, which is an alternation of generations between an asexual polypoid stage and a sexual medusoid stage. Chondrichthyes is the taxonomic class that includes cartilaginous fishes such as shark. They typically have their skin covered with placoid scales.