Classification of $Reptilia$ is based on

The type of dentition in $Crocodile$ is

In which of the following animals do sperm remain viable for a long period inside the female body?

Which of the following is a non-poisonous viviparous snake?

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.

Which animals cast off their scales as skin casts?