Which among the following is an exception to possessing a three-chambered heart?

The most highly advanced character in crocodile $(Reptilia)$ is the presence of

An animal which has both exoskeletal and endoskeletal structures is

The type of dentition in $Crocodile$ is

To which of the following categories do dinosaurs belong?

Statement $A$: The name 'Reptilia' is derived from the Latin word 'repere' or 'reptum',which means 'to creep' or 'to crawl'.
Statement $B$: Since they creep or crawl,it is not necessary that all animals of the class Reptilia are limbless.