The body of a snail is divided into head?

Analyze the question: The question is asking about the body plan of a snail, which is a mollusc (Phylum Mollusca, Class Gastropoda). The wording is a little incomplete, but it is the standard JAMB question: "The body of a snail is divided into head, _ and _."

Concept: Molluscs have soft, unsegmented bodies. The body of a snail has three main regions:

1. Head: carries the tentacles (with eyes) and the mouth.
2. Foot: a muscular, flat structure on the underside used for creeping. It secretes mucus to ease movement.
3. Visceral mass: a hump-like part containing the internal organs (heart, digestive organs, reproductive organs). It is covered by the mantle, which secretes the coiled shell.

Eliminating the options:

• A. thorax and abdomen: These are insect and arthropod body divisions, not mollusc ones. ❌
• B. visceral mass and abdomen: Snails have no abdomen as a distinct body region. ❌
• C. thorax and foot: Snails have no thorax. ❌
• D. visceral mass and foot: This matches the snail's body plan of head, visceral mass and foot. ✅

**Answer: D. visceral mass and foot.

Exam tip: Remember that "thorax and abdomen" belong to insects (head, thorax, abdomen). For molluscs, think "Head, Foot, Visceral mass", plus the mantle and shell. If you see "thorax" in an option about a snail, you can cross it out immediately.