Answer:
1- Life on land require higher standards of vision and behavior. The environmental adaption of visual system of reptiles is an example of the evolutionary process. Competition on land is increase so that is why reptiles are forced to become partially or completely nocturnal.
2- In general total brain volume weakly correlates with intelligence, correlation value is around 0.3 to 0.4 out of 1. In simple words the brain volumes related to characteristics about 9% to 16%