Carapace is present in

An animal which has both exoskeletal and endoskeletal structures is

Snakes have:

Which of the following snakes is non-poisonous?

Given below are two statements:
Statement $I$: The class name Reptilia refers to creeping or crawling mode of locomotion.
Statement $II$: All organisms belonging to Reptilia have three chambered heart.
In the light of the above statements, choose the most appropriate answer from the options given below:

Which of the following is a poikilothermic (cold-blooded) animal?