Similarities:
- Mollusca is very similiar to the Annelids due to their common ancestor
- Mollusca and Annelids both removes metabollic wastes through nephridia
- Blood are pumped by heart in both Mollusca and Annelids
- Mollusks and Cnidarians are both marine animals
- Mollusks (Cephalopods and Gastropods) feeds on food including detritus and some Annelids also feed on detritus
- Molluks, Annelids, Platyhelminthes and Nematoda may be hermiphrodites under desperate conditions when they need to reproduce
Differences:
- Mollusca have one heart while Annelids have five hearts
- Mollusca can have open circulatory system but Nematoda and Platyhelminthes have closed circulatory system
- Mollusks are marine creatures while Nematoda and Platyhelminthes are land creatures
- Mollusks have a more complex system then any other phyla
- Mollusks have shells, either externally or internally, but phylum such as Cnidarians, Annelids, Nematoda and Platyhelminthes do not
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