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Which one of the following groups of animals each is correctly matched with their one characteristic morphological feature?

1. Liver fluke, Sea anemone, Sea cucumber - Bilateral symmetry
2. Centipede, Prawn, Sea urchin - Jointed appendages
3. Scorpion, Spider, Cockroach - Ventral solid central nervous system
4. Cockroach, Locust, Taenia - Metameric segmentation

Correct answer: Scorpion, Spider, Cockroach - Ventral solid central nervous system

Solution

Scorpion, spider, and cockroach are all arthropods, and arthropods characteristically have a ventral, solid central nervous system. The other options include animals that do not share the stated feature across the whole group.

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