Phosphorus is a chemical element
with symbol P and atomic number 15.
Elemental phosphorus exists in two major forms,
white phosphorus and red phosphorus,
but because it is highly reactive,
phosphorus is never found as a free element on Earth.
It has a concentration in the Earth's crust
of about one gram per kilogram.
In mammals, the ****** is the elastic,
muscular part of the female genital tract.
In humans, it extends from the ***** to the ******.