The image shows a four-chambered heart, characteristic of mammals and birds. Among the given options, gills (2) are characteristic of aquatic animals, mammary glands (3) and convoluted brain (1) are characteristic of mammals, and wings (4) and dry scaly skin (5) are characteristic of birds and reptiles respectively. Since the heart shown is a four-chambered heart, it is most likely to be a mammal or a bird. However, the options provided are not mutually exclusive for these groups. Considering the typical representation of such a heart in educational contexts, it often refers to mammals. Therefore, characteristics associated with mammals are most probable.
Ответ: 1, 3