Question

Объясните, почему ящерица не может дышать кожей.

Answer 1

Потому что ее кожа грубая, сухая, не содержит желез, покрыта чешуями. 
А ко второму ответу, для общего развития добавлю, что много кто кожей дышит, в тч. и человек. Для газообмена всего организма это большой роли не играет, а вот для самой кожи- это огромное значение. Так кожа остается свежей. 
Лягушки, к примеру, дышат как кожей, так и легкими. Их кожа влажная, содержит железы, выделяющие слизь. Влага делает возможным дыхание. Если б у лягушки было б только легочное дыхание, то она бы задохнулась

Answer 2

Why Lizards Can't Breathe Through Their Skin

Lizards cannot breathe through their skin due to a few key reasons:

1. Skin Structure: - The skin of lizards is not designed to facilitate gas exchange for respiration. - Lizard skin is relatively impermeable to gases, which prevents efficient gas exchange necessary for respiration.

2. Respiratory System: - Lizards have a specialized respiratory system that relies on lungs for gas exchange. - Their lungs are the primary organs for breathing, and they do not have the ability to extract oxygen from the environment through their skin.

3. Evolutionary Adaptation: - Over time, lizards have evolved to rely on their lungs for respiration, and their skin has not developed the necessary adaptations for cutaneous respiration. - This evolutionary adaptation has led to the reliance on pulmonary respiration rather than cutaneous respiration.

In summary, the inability of lizards to breathe through their skin is primarily due to the structure of their skin, their specialized respiratory system, and evolutionary adaptations that have favored pulmonary respiration over cutaneous respiration.