Which features make reptiles successful on land?

Four features make reptiles true land animals:
(a) The amnion (embryonic membrane) encloses the embryo and provides it with a watery environment during development, therefore, the embryo does not need watery environment.
(b) Internal fertilization.
© Shell around the egg to check desiccation.
(d) Horny scales on the body of reptiles check loss of water.