200 A Industrial fuse. 80 kA breaking capacity. In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit including the source of power and the load.
In order for natural selection to operate on a trait, the trait must possess heritable variation and must confer an advantage in the competition for resources. If one of these requirements does not occur, then the trait does not experience natural selection.
Basically, this is simple effect of breeding. Natural selection is the effect natural variation has on survival of a species. Consider the variational model to produce 10 children from one parent set, where the fingers are ranging from very short, to longer and very long.