The scrotum is a loose sack of skin that holds the testicles, which produce sperm. Sperm cells can only survive in a fairly limited temperature range, so if it starts to get too cold, the scrotum will tighten to pull the testicles closer to the body. If it gets too warm, the scrotum will relax.
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The scrotum acts as a sack to hold and support the testes outside the body, allowing sperm to develop at a temperature lower than that of the internal body.
The function of a scrotum is purely to hold the testicles and help regulate their temperature by holding them closer or further away from the body.
One function is to dissipate heat from your body. For example, if you sleep under too many covers for the ambient temperature, you will wake up with drenched underwear from sweating profusely.
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.