Which of the following is a poisonous snake?

The exoskeleton of dry scales is a characteristic feature of ....

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 of the following organisms possess two atria and an incompletely divided ventricle?

Snakes have:

Which of the following cannot be classified as an amphibian?