Classification of Animals
Question
The central nervous system consists of a double ventral nerve cord in
Moderate
Solution
The neural system of annelids (e.g., Pheretima) consists of paired ganglia connected by lateral nerves to a double ventral nerve cord. Physalia (a cnidarian) has a network of neurons. Pisaster is a starfish. Its neural system consists of a nerve ring and five radial nerves extending into the arms. Chordates (e.g., Petromyzon) possess a single dorsal nerve cord.
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