the ESOPHAGUS is a tube in the throat which food goes down when you swallow. (swallowing is mostly involuntary because the esophagus is made of smooth muscle, a type of muscle that works without control of the brain.) The food goes down into the stomach. On the top half of the esophagus is a sphincter, as well as on the bottom half. they help close off the esophagus.
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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.