Answer
There are several structural feature that enabled amniotes to adapt successfully to terrestrial life:
1, The amniotic egg
2. The egg shelll
3. keratinized skin
4. Modified kidneys
5. Modified Breathing apparatus
6 Modified special senses
Work Step by Step
The amnion provides an internal watery and electrolytically stable environment in which the embryo can safely develop. This internal "pond' also cushions the embryo from shocks
The development of the shelled is important for several reasons; it provides mechanical support and protection against pathogens; it also protects against dehydration and some predators.
The keratinized skin of neonates and mature animals also protect against dehydration in the terrestrial environment
Modified kidneys excrete mostly urea acid and conserve which is more convenient than to excretion uric acid.
Modified ventilation (rib) by lungs , is essential out of a watery environment
Modified and expanded sense organs
