Which one of the following is not a characteristic of phylum Annelida?
Metamerism
Closed circulatory system
True coelom
Diploblastic
Other:
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Explanation:
Annelids are the protostomes having a series of rings or segments that make up their whole body. Both the body wall and many of the internal organs exhibit segmentation to facilitate locomotion.
A ventral nerve cord and a simple brain consisting of a pair of ganglia make the annelid nervous system.
Coelom is a fluid-filled space present between the body wall and digestive tube. The flow of blood through the complete system of blood vessels constitute the closed circulatory system.
Annelids have a large, well-developed coelom and a closed circulatory system
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