In order to ponder over the subtleties of mind and its essential ingredient known as natural intelligence we have to enter into the realm of its magical creation under the rational plans of genetical combinations of transcription and translation of genius genes vs non-genius genes. In addition to its existential genetic reality, its pragmatic approach highly conforms to the rules and regulations of environmental demands. If that genetic makeup of mind doesn't fit in nature to cope with the environmental challenges, it results in mere nervous breakdown When we talk about these challenges that affect the whole peace of mind, stress is the biggest challenge for all faculties of mind and its pragmatic mentality and a strongly built mind with acute intelligence responds well to any surrounding stressful situation definitely entails the expression of natural coding of healthy genes beyond any mutant code.
Human natural intelligence can also be defined with regards to its overall response to all those factors which directly influence the practicability of human mind while facing the troubles and tribulations in all walks of life. "The better the response the stronger the mind" highly recommends the genetic evolution of brain with its proper functionality. Human mind is the best product of evolutionary process of genetical expressions of the creation of humankind.
The triangular relationship of human intelligence with genetics and environment implies certain time-bound abstruse intricacies entitled to get unentangled giving deep experiential knowledge about the age of evolution of mind since the inception of time. The adaptive ability of genetic variation of mind determines its tackling calibre in the shockingly repellent psychotic and neurotic phases of ailing mindset and expressing the ingenuity and mind-boggling imagination of dysphoric and maniac phases of sound mindset. That phasic changes of mind are highly contingent on reversible and irreversible environmental factors.