[Xavier_Spinner_Wheels]

Intelligence does not rely on time or environmental change and is certainly not the end result of any evolutionary path. In the case of Homo and its ancestors we would not have evolved intellectually had we not the means to adapt and in our case having hands to manufacture a range of sophisticated tools.

Such attributes placed us in a position to advance and coupled with environmental change made us think of different ways to survive. This in turn would stimulate the brain to be more inventive, and so develop to become our greatest asset (assisted by our dexterity), which can be clearly seen by the gradual increase in brain size.

Other intelligent beings, although they have been around for as long, or longer than our line of evolution have not developed past an eliminatory stage simply because they do not have the physical ability to manipulate items to the same extent that a pair of hands are able. Because of this, their mental processes are restricted, as they are limited to what their physical bodies have evolved to perform.