1) Features of breathing – due to the appearance in the skeleton of the chest, which provides inhalation and exhalation. Breathing is only pulmonary. The lungs are of a complex, cellular structure with a larger respiratory surface than in amphibians.
2) Features of the structure of the integument – dry skin, covered with horny scales, which protects the body from drying out.
3) Features of reproduction – internal fertilization, large eggs, rich in nutrients
you and covered with a leathery membrane or shell that protects them from drying out, the appearance of fully formed reptiles from the eggs.
4) Features of the excretory system, which requires a negligible amount of water to isolate the products of nitrogen metabolism.
5) Features that provide a higher level of metabolism than in amphibians – More complete separation of arterial and venous blood flows, a three-chambered heart with an incomplete septum.
6) More perfect nervous system.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.