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.

Phylum/Class	Excretory organ	Circulatory system	Respiratory organ
Arthropoda	$...............$	$...............$	Lungs/Gills/Tracheal system
$...............$	Nephridia	Closed	Skin/Parapodia
$...............$	Metanephridia	Open	$...............$
Amphibia	$...............$	Closed	Lung

Column-$I$	Column-$II$
$(A)$ Starfish	$(p)$ Sepia
$(B)$ Jellyfish	$(q)$ Asterias
$(C)$ Devilfish	$(r)$ Aurelia
$(D)$ Cuttlefish	$(s)$ Octopus

Identify the mismatched pair regarding the endoskeleton of animals.

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