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Write the general characters of the phyl...

Write the general characters of the phylum mollusca.

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1. Molluscs are terrestrial or aquatic with organ system level of organisation.
2. They are triploblastic, bilaterally symmetrical, coelomate animals.
3. Body is divided into head. foot and visceral hump.
4. The digestive system is complete.
5. Nephridia are the excretory organs.
6. Open type of circulatory system is seen.
7. Blood contains copper containing respiratory pigment called hemocyanin.
8. They are oviparous.
9. Development is indirect with a veliger larva. e.g., Pila and Octopus.
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