Question on: JAMB Biology - 2000

The coelom is a fluid-filled body cavity found in many animal groups.

• Coelenterata (also known as Cnidaria): These animals, such as jellyfish and corals, lack a true coelom. They have a simple sac-like body plan with a single opening that serves as both mouth and anus. The space within the body is called the gastrovascular cavity.
• Mollusca: Molluscs (e.g., snails, clams) have a coelom, although it is often reduced and surrounds the heart.
• Reptilia: Reptiles (e.g., snakes, lizards) are advanced animals that possess a coelom.
• Arthropoda: Arthropods (e.g., insects, spiders) possess a coelom

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