It indicates that humans belong to the class Mammals.

1) Like all mammals, a human female feeds her baby with milk from the lactiferous glands.
2) the development of the embryo occurs in the uterus
3) an external auricle appears in mammals.
4) differentiated teeth (incisors, canines, small and large molars)
5) the body of mammals is covered with wool, in humans, the coat is reduced, but thin hairs cover the whole body (with the exception of the palms and feet). The hair is most pronounced on the head, in the armpit and groin area.
6) the brain has a well-developed cerebral cortex (the largest and evolutionarily youngest part of the brain), which has grooves and convolutions. This structure provides a large surface area.
7) the cervical spine has 7 vertebrae.
8) the presence of the alveolar lungs and the muscular septum – the diaphragm that separates the chest cavity from the abdominal cavity.
9) due to the need to maintain a constant body temperature, sweat glands appear, secreting sweat on the skin surface. As it evaporates, it cools the body.