An important component of the development and growth of different parts of the human body is the disassembly of organs and structures from previous stages. The most obvious example is metamorphosis in insects, but this process also occurs in humans during the development of sex glands and during postlactational involution of the mammary gland.
Click here for original story, The disassembly of organs during metamorphosis is a precise process orchestrated by hormones
Source: Phys.org