Select the correct statement.

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(D) $1$. Option $A$ is incorrect because crocodiles have a four-chambered heart.$2$. Option $B$ is incorrect because cartilaginous fishes (Chondrichth

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All cyclostomes lack jaws and paired fins.

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(D) $1$. Option $A$ is incorrect because crocodiles have a four-chambered heart.$2$. Option $B$ is incorrect because cartilaginous fishes (Chondrichthyes) do not have an operculum.$3$. Option $C$ is incorrect because some mammals like the platypus and echidna are oviparous.$4$. Option $D$ is correct because members of the class Cyclostomata are characterized by the absence of jaws and paired fins.

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