Changes

* Almost all reptiles are covered by a protective layer of dry skin with almost no glands.  The epidermis is raised to form scales or scutes.  This prevents excessive water loss, thus is essential for terrestrial existence.

* Almost all reptiles are covered by a protective layer of dry skin with almost no glands.  The epidermis is raised to form scales or scutes.  This prevents excessive water loss, thus is essential for terrestrial existence.

* They developed a large, yolked egg, allowing the embryo sufficient food reserves to develop fully before hatching.  The yolked egg is surrounded by protective extra-embryonic membranes (the amnion and allantois), serving for respiration and the storage of waste.  There is also a protective calciferous shell to prevent it from drying out.

* They developed a large, yolked egg, allowing the embryo sufficient food reserves to develop fully before hatching.  The yolked egg is surrounded by protective extra-embryonic membranes (the amnion and allantois), serving for respiration and the storage of waste.  There is also a protective calciferous shell to prevent it from drying out.

= Temperature Dependent Sex Determination (TDSD) =

= Temperature Dependent Sex Determination (TDSD) =