Social attitudes towards children started to change in the middle of the 19th century, and childhood gradually came to be seen more as a distinct phase of life, separate from adulthood, with children needing protecting from the hardships of adult life, especially work and provided with more guidance and nurturing
froth of facial hair, deeper voice, and I believe broader shoulders. testosterone can make you taller, but not significantly so if you have left the puberty years.
Homeostasis refers to the bodies ability to seek and maintain a constant state of equilibrium within its internal environment when dealing with external changes.