when does a function have an inverse function
Inverse function Not all functions have inverse functions. In order for a function f: X → Y to have an inverse,[nb 1] it must have the property that for every y in Y there must be one, and only one x in X so that f(x) = y. This property ensures that a function g: Y → X will exist having the necessary relationship with f.
Human reproductive system The female reproductive system has two functions: to produce egg cells, and to protect and nourish the fetus until birth. The male reproductive system has one function: to produce and deposit sperm. Humans have a high level of sexual differentiation. In addition to differences in nearly every reproductive organ, there are numerous differences in typical secondary sex characteristics.