Which invertebrate animals possess a calcium | vedclass

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(B) The correct answer is $B$. $1$. Mollusca: Most mollusks have a hard shell made of calcium carbonate $(CaCO_3)$ which serves as an exoskeleton. $2$

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Mollusca-Porifera

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(B) The correct answer is $B$. $1$. Mollusca: Most mollusks have a hard shell made of calcium carbonate $(CaCO_3)$ which serves as an exoskeleton. $2$. Porifera: Many sponges (Porifera) possess spicules made of calcium carbonate or silica,which form their internal skeletal framework. $3$. Arthropoda have an exoskeleton made of chitin. $4$. Annelida generally lack a hard mineralized skeleton.

Column-$I$	Column-$II$
$(a)$. Planula	$(i)$. Mussel
$(b)$. Glochidium	$(ii)$. Crab
$(c)$. Nauplius	$(iii)$. Obelia
$(d)$. Cysticercus	$(iv)$. Nereis
	$(v)$. Taenia solium

Which invertebrate animals possess a calcium carbonate skeleton?

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Column-$I$ Column-$II$
$(a)$. Planula $(i)$. Mussel
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