Hard shelled or leathery eggs that can incubate/hatch outside of water, allowing them to migrate dry areas. Skin that prevents transpiration, allowing them to live on land without dehydrating. These would be primary...the third could be any of a number of adaptations, changes in locomotion, eye sight et cetera
Shells prevent their eggs from drying out. Scales prevent water loss and protect them. The circulatory systems is associated with lungs for breathing air. Internal fertilization allows for reproduction on land.
Internal... :)Male and female reptiles do not have external genitalia to help owners ... For fertilization, a male reptile inserts either one of his two hemipenes into the ... Before actual copulation, the pair usually engages in some type of ritualized courtship...Good luck with what your doing... :)
Reptiles have scaly skin that helps prevent water loss, compared to the permeable skin of amphibians that requires moisture to breathe and stay hydrated. Additionally, reptiles have more efficient lungs that allow them to fully rely on breathing air, while amphibians have dual respiration capabilities through both lungs and skin. Lastly, reptiles lay amniotic eggs with protective shells that allow for successful reproduction on land, unlike amphibians that typically rely on aquatic environments for their eggs to develop.
Colonise land.
Snakes, being cold-blooded like all reptiles - live in temperate and tropical environments. The need to live in places that are at least warm enough to allow them to move freely around in search of prey.
Bivalves have two shells that protect their soft bodies. These shells are hinged together to allow the bivalve to open and close.
adaptation
Ability to breathe air.
Waterproof skin and waterproof eggshells.
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Yes, crocodiles are reptiles and they lay amniotic eggs with protective shells that allow the embryos to develop outside of the mother's body. This is a characteristic feature of reptiles, including crocodiles.