Biology · ANIMAL KINGDOM

Which statement accurately describes the neural system and excretory structure in Phylum Annelida?

1. Neural system consists of paired ganglia connected by lateral nerves to a double ventral nerve cord, and excretion/osmoregulation is performed by nephridia.
2. Neural system lacks ganglia, and excretion is carried out by choanocytes.
3. Excretion occurs through water vascular canal system, and nerves form a diffuse nerve net.
4. Neural system consists of a single dorsal nerve cord, and excretion occurs by flame cells.