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Which one of the following is a matching pair of a body feature and the animal possessing it?

1. Ventral central nervous system - Leech
2. Pharyngeal gill slits absent in embryo - Chameleon
3. Ventral heart - Scorpion
4. Post-end tail - Octopus

Correct answer: Ventral central nervous system - Leech

Solution

Leeches are annelids, and annelids characteristically have a ventral nerve cord, so the pair matches. The other options mismatch known anatomical features: scorpions have a dorsal heart, chameleons are vertebrates with pharyngeal structures in development, and octopuses do not have a post-anal tail.

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