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| 1. |
Explain Annelida.... |
| Answer» \tThe body surface of Annnelids is distinctly marked out into segments or metamere and, hence, the phylum name Annelida.\tThey exhibit organ-system level of body organization, bilateral symmetry,they are triploblastic, metamerically segmented and coelomate animals.\tAquatic annelids possess lateral appendages called asparapodia. For example- Nereis\tNephridia help in osmoregulation and excretion.\tNeural system consists of paired ganglia connected by lateral nerves to a double ventral nerve cord.\tReproduction is sexual.\tNereis, an aquatic form, is dioecious, but earthworms and leeches are monoecious.Examples - Nereis, Pheretima (Earthworm) | |