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

Question

Animals		Morphological features
Scorpion, spider,		ventral solid central cockroach nervous system

Animals		Morphological features
Cockroach, locust, Taenia		metameric segmentation

Animals		Morphological features
Liver fluke, sea anemone, sea cucumber		bilateral symmetry

Animals		Morphological features
Centipede, prawn, sea urchin		jointed appendages

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