Haemocoel is present in

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(D) In $Arthropoda$ and $Mollusca$,the true coelom is reduced.The blood-filled spaces between the viscera merge to form a large cavity called the haem

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Scolopendra

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(D) In $Arthropoda$ and $Mollusca$,the true coelom is reduced.The blood-filled spaces between the viscera merge to form a large cavity called the haemocoel.$Scolopendra$ belongs to the phylum $Arthropoda$ (class $Myriapoda$),which is characterized by the presence of a haemocoel.$Hydra$ is a $Cnidarian$,$Earthworm$ and $Nereis$ are $Annelids$ (which possess a true coelom).

Column-$I$	Column-$II$
$(a)$. $A$ vector of disease	$(i)$ Bombyx
$(b)$. $A$ gregarious pest	$(ii)$ Limulus
$(c)$. $A$ living fossil	$(iii)$ Locusta
$(d)$. An economically important insect	$(iv)$ Culex

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Match Column-$I$ with Column-$II$.
Column-$I$ Column-$II$
$(a)$. $A$ vector of disease $(i)$ Bombyx
$(b)$. $A$ gregarious pest $(ii)$ Limulus
$(c)$. $A$ living fossil $(iii)$ Locusta
$(d)$. An economically important insect $(iv)$ Culex

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