MCQ
This part is not associated with nerve ring.
- ASupraoesophageal ganglion
- BSuboesophageal ganglion
- CCircum-oesophageal commisure
- ✓Abdominal ganglia
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$(a)$ Metagenesis is observed in Helminths.
$(b)$ Echinoderms are triploblastic and coelomate animals.
$(c)$ Round worms have organ-system level of body organization.
$(d)$ Comb plates present in ctenophores help in digestion.
$(e)$ Water vascular system is characteristic of Echinoderms.
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