Biology · Diversity of Life Forms

Match the animal phyla/classes (Column X) with their unique defining set of characteristics (Column Y): • A. Phylum Platyhelminthes → (iii) Bilateral symmetry, acoelomate, triploblastic, usually with a flattened body and an incomplete digestive tract (if present) • B. Phylum Annelida → (iv) Segmented body (metamerism) with a true coelom, chitinous chaetae, closed circulatory system • C. Class Insecta → (v) Exoskeleton of chitin, three main body parts (head, thorax, abdomen), six legs, usually with wings in the adult stage • D. Phylum Echinodermata → (ii) Radial symmetry (often pentamerous as adults), water vascular system, exclusively marine, deuterostomes Which one of the following options represents the correct match?