Identify the mismatched pair regarding the en | vedclass

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(A) $1$. Cyclostomata (e.g.,lampreys and hagfish) possess a cartilaginous cranium and vertebral column,but they do not have a 'fibrous' endoskeleton i

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Fibrous and cartilaginous endoskeleton - Cyclostomata

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(A) $1$. Cyclostomata (e.g.,lampreys and hagfish) possess a cartilaginous cranium and vertebral column,but they do not have a 'fibrous' endoskeleton in the context of typical biological classification; however,the term 'fibrous' is not a standard descriptor for their endoskeleton. $2$. Chondrichthyes (cartilaginous fishes) have an endoskeleton composed entirely of cartilage. $3$. Echinoderms possess an endoskeleton consisting of calcareous ossicles (calcium carbonate plates). $4$. Osteichthyes (bony fishes) have an endoskeleton composed of bone. $5$. Therefore,the pair 'Fibrous and cartilaginous endoskeleton - Cyclostomata' is considered the mismatched pair as 'fibrous' is not the defining characteristic of their endoskeleton.

Column-$I$	Column-$II$
$I.$ Platyhelminthes	$p.$ Malpighian tubules
$II.$ Aschelminthes	$q.$ Renette cells
$III.$ Arthropoda	$r.$ Flame cells
$IV.$ Annelida	$s.$ Nephridia

Identify the mismatched pair regarding the endoskeleton of animals.

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Match the following columns:
Column-$I$ Column-$II$
$I.$ Platyhelminthes $p.$ Malpighian tubules
$II.$ Aschelminthes $q.$ Renette cells
$III.$ Arthropoda $r.$ Flame cells
$IV.$ Annelida $s.$ Nephridia

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