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

Which of the following reptiles possesses a four-chambered heart?

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:

In which animal is a heart with an incompletely divided ventricle found?

Which of the following is an oviparous animal?

Even though the ventricles of reptiles are partitioned,there is still mixing of blood. Why?