If a mammal gives birth to live animals, how is a monotreme a mammal if it lays eggs? This has been confusing me for the past like hour

In some ways, monotremes are very primitive for mammals because, like reptiles and birds, they lay eggs rather than having live birth. ... Like other mammals, however, monotremes have a single bone in their lower jaw, three middle ear bones, high metabolic rates, hair, and they produce milk to nourish the young.

Explanation:

homeostasis is the tendency towards a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes. and this is how it applies to the integumentary system. back to top. skin functions in homeostasis include protection, regulation of body temperature, sensory reception, water balance, synthesis of vitamins and hormones, and absorption of materials. when body temperature falls, the sweat glands constrict and sweat production decreases.