Question
Write down four main characters of Annelida.
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Answer
- Body triploblastic, bilaterally symmetrical, soft, elongated, vermiform and cylindrical or dorsoventrally flattened.
- Exoskeleton absent; body is covered by a thin cuticle.
- Alimentary canal is tube-like, complete and extends straight from mouth to anus.
- Reproduction is by sexual means. Sexes may be united (hermaphroditic) or separate.
Example: Nereis (sand worm) and Hirudinaria (leech).
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