Which one of the following is a limbless lizard?

Dry skin with scales or scutes without glands is a characteristic of

$A$: The tortoise is classified under the class $Reptilia$.
$R$: The tortoise is a triploblastic,poikilothermic animal with epidermal scales.

An animal which has both exoskeletal and endoskeletal structures is

Which of the following animals has a three-chambered heart?

Which one is a poikilothermic $(cold-blooded)$ animal?