Speciation in a geographically isolated population is just the most common type of speciation (the so-called allopatric speciation). If a population is reproductively isolated from other populations of this species, then due to mutational and genetic-automatic processes, irreversible changes accumulate in its gene pool, which distinguish it from all other populations. In addition, the specificity of habitat conditions can lead to the development of unique adaptations. Over time, the differences of this population from all others can reach the species rank.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.