The formation of new and distinct species in the course of evolution.In humans the vermiform appendix is a vestigial structure; it has lost much of its ancestral function. Vestigiality refers to genetically determined structures or attributes that have apparently lost most or all of their ancestral function in a given species, but have been retained during the process of evolution.In its uncultivated form, it is known as wild cabbage. It is native to coastal southern and western Europe. Its high tolerance of salt and lime and its intolerance of competition from other plants typically restrict its natural occurrence to limestone sea cliff, like the chalk cliffs on both sides of the english channel and the windswept coast on the western side of the Isle of Wight