In contrast to Annelids,the Platyhelminthes s | vedclass

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(A) Platyhelminthes are acoelomate,meaning they lack a body cavity lined with mesoderm.In contrast,Annelids are true coelomates (schizocoelomates),whi

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Absence of body cavity

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(A) Platyhelminthes are acoelomate,meaning they lack a body cavity lined with mesoderm.In contrast,Annelids are true coelomates (schizocoelomates),which means they possess a body cavity that is completely lined by mesoderm.Therefore,the primary difference regarding the body cavity is the absence of a coelom in Platyhelminthes compared to the presence of a true coelom in Annelids.

Column-$I$	Column-$II$
$(a)$ Gill slits open	$(i)$ Lamprey
$(b)$ Absence of paired fins	$(ii)$ Scorpion
$(c)$ Calcareous shell	$(iii)$ Wuchereria
$(d)$ Absence of flame cells	$(iv)$ Oyster
$(e)$ Ecdysis	$(v)$ Shark

In contrast to Annelids,the Platyhelminthes show

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Column-$I$ Column-$II$
$(a)$ Gill slits open $(i)$ Lamprey
$(b)$ Absence of paired fins $(ii)$ Scorpion
$(c)$ Calcareous shell $(iii)$ Wuchereria
$(d)$ Absence of flame cells $(iv)$ Oyster
$(e)$ Ecdysis $(v)$ Shark

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