What reptilian adaption allowed reptiles to live on land?

Answer 1

The development of the amniote egg. Reptiles are considered the first true land animals. It was this egg that allowed the reptiles to conquer the land and begin a reign that lasted hundreds of millions of years.
A thick dry skin covered with scales made of a protein called Keratin. Reptiles molt as they grow.
Reproduction is sexual with internal fertilization. Most are oviparous, while some snakes and lizards are either ovoviviparous or viviparous.
Respiration occurs through well developed lungs, and in some turtles a moist cloacal surface.
Reptiles are ectotherms. Being ectothermic enables an organism to survive on much less food than an endothermic organism.
Most reptiles contain a 3 chambered heart with a partially divided ventricle. Crocodiles contain a 4 chambered heart.

Answer 2

i think it is the fact that they lay eggs with membranes (so the eggs don't dry out).