The mammalia,or breasts.
No - part of the definition of a mammal is that it is a vertebrate with hair, viviparous birth, endothermic and produces milk to nourish their young. A vertebrate is, by definition, an animal with a distinct backbone.
Both the hippopotamus and pig cannot sweat due to the fact that they have no sweat glands. The platypus is the only mammal that does not have live young; they lay eggs. Lastly, every mammal produces milk, it's part of what classifies them as mammals (but then again, so is having live young, but that's been proven wrong). By the way, the female platypus will produce milk for her young.
The udder. The skin, which has hair, is also a body part that shows that a cow is a mammal.
mammary alveolus
nose
The ovaries.
mammary gland
The nervous system, especially the brain, produces endorphins.
Liver
your vocal cords
the heart
The endocrine system is the part of the body that produces hormones which act on the rest of the body. An endocrinologist, therefore, studies that system and the hormones it produces.