First slide
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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