The endocrine system is composed of glands that engender and secrete hormones, chemical substances engendered in the body that regulate the activity of cells or organs. These hormones regulate the body's magnification, metabolism (the physical and chemical processes of the body), and sexual development and function.
The male reproductive cells are in the scrotum on the males body.
The Tundra is located near the equator and contains trees that form dense canopy layers.