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Annelida is advanced over Nematoda in having
Option: 1
Closed circulation
Option: 2
Metameric segmentation
Option: 3
True coelom
Option: 4
All of these
Answers (1)
Phylum Annelida-
- The term ‘Annelida’ is derived from the latin term annellus, that implies small rings. This phylum contains the animals that are also called ‘Ringworms’.
- The body of annelids is truly segmented because these segments or metameres are externally visible as annuli and internally as septation.
- Segmentation improves the movement and enhances the chances of survival by providing redundancy.
- They are triploblastic and bilaterally symmetrical.
- They have a true coelom, i.e., they are coelomate. The mesoderm lines the cavity on both sides.
-
Closed circulation, metameric segmentation and true coelom are the advanced features shown by annelids.
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