Not every relation is a function. But every function is a relation. Function is just a part of relation.
The cubic function.
Range
A formula or graph are two ways to describe a math function. How a math function is described depends on the domain of the function or the complexity of the function.
The Mandelbrot graph is generated iteratively and so is a function of a function of a function ... and in that sense it is a composite function.
The caruncle is the little pink nodule on the inside corner of the eye. It is comprised of sebaceous oil and sweat glands.
Caruncle
dewlap or caruncle
Caruncle
A urethral caruncle is a prolapse of the female urethra. It is more common with age.
The conical body in the medial corner of the eye is the lacrimal caruncle. It is a small, fleshy mass that contains sebaceous and sweat glands, as well as hair follicles. Its main function is to produce a small amount of tears to keep the eye moist.
the iris, pupil, eyelid and caruncle
caruncle
The function of the caruncula lacrimalis is uncertain. It contains sebacous and sweat glans but they seem unimportant in the presence of the tear glands and Meibomian glands. The form of the caruncula may have a fnction by itself, enhancing the outflow of tears through the canaliculi during blinking of the eyelids.
caruncle.
The male Andean condor, has a naked fleshy crest on the top of head, called a caruncle.
The red structure in the medial eye is the conjunctiva, which is a thin, transparent membrane that covers the white part of the eye (sclera) and lines the inside of the eyelids. Its main function is to protect the eye and keep it moist by producing mucus and tears.