5.1. Выберите рисунок, на котором изображена дыхательная система волка.

The image displays four diagrams representing different biological systems. The question asks to identify the respiratory system of a wolf. By visual inspection, the fourth diagram, showing a pair of lungs with intricate internal structures, most closely resembles the respiratory system of a mammal like a wolf. The other diagrams depict simpler structures or are not anatomically consistent with mammalian lungs.