Choose the correct statement.

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(B) The correct statement is $B$. $A$: Incorrect,because some mammals like $Ornithorhynchus$ (platypus) and $Tachyglossus$ (echidna (echidna) are ovip

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All cyclostomes do not possess jaws and paired fins.

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(B) The correct statement is $B$. $A$: Incorrect,because some mammals like $Ornithorhynchus$ (platypus) and $Tachyglossus$ (echidna (echidna) are oviparous. $B$: Correct,all cyclostomes are characterized by the absence of jaws and paired fins. $C$: Incorrect,because crocodiles are reptiles that possess a four-chambered heart. $D$: Incorrect,because in cartilaginous fish (Chondrichthyes),gills are not covered by an operculum,except in $Chimaera$.

$A$	$B$	$C$
$(1)$ Tube feet	$(a)$ Helps in digestion	$(e)$ Mollusca
$(2)$ Radula	$(b)$ Helps in balance	$(f)$ Echinodermata
$(3)$ Statocyst	$(c)$ Helps in locomotion	$(g)$ Annelida
$(4)$ Setae	$(d)$ Water vascular system	$(h)$ Arthropoda

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