what do reptiles do to adapt?

Question

what adaptations do most reptiles have to live on land for:
prevent of water loss
climbing running
circulation

Answer 1

Reptiles: Early Consumers on Land
http://www.fiu.edu/~longoria/gly1101/Mz-reptiles.htm

Reptiliomorpha
http://www.palaeos.org/Reptiliomorpha

Answer 2

Living beings don't "do things TO adapt". They're adapted because of their evolutionary history.
As for adaptations, all reptiles are amniotes and as such have water-proof tegument which prevents water loss, and also they excrete their nitrogen wastes as uric acid, a concentrate of white crystals that needs very little water to come out of the body (unlike our own liquid urine).
The circulatory system is not the same in all "reptiles", basically because they're not a natural group. Turtles and squamates (lizards and snakes) have a 3-chambered heart; the circulation of blood through the lungs and through the body are partly separated anatomically, and almost completely separated functionally (thanks to the valves and septa in their heart).
Crocodiles have a 4-chambered heart like their relatives the birds, and the blood from the body and from the lungs only mixes through a "window" that exists between the 2 major vessels that exit the heart, and only when they're diving without breathing.
As for locomotory adaptations... reptiles are so diverse that there are many different examples. Here's a web page with examples of ecomorphological variation (=morphology in relation to habits and habitats):
http://uts.cc.utexas.edu/~varanus/ecomorphology.html

Answer 3

They have a thick epidermis to prevent water loss. The skin is covered with scales.