On inter-relationship of Subjective and Objective Reality

There is an objective reality which we all relate to in an entirely subjective way. Our various subjective realities each reflect to varying degrees the objective reality around us, but generally speaking they all are essentially accurate. The cause of this essentally reliable relationship between our subjective and objective realities is a matter of the evolution of our minds over time. Our Subjective Reality is the result of the interaction between the objective reality around us and our brain archetecture, which is the result of our genetics, which result from the evolutionary course of our species, this course having been guided by the interactions of our ancestors with the objective reality around them.
This connection between our various individual subjective conceptions of reality and the shared objective reality in which we all exist is the source of both our perceived a priori knowledge and our actual a posteriori knowledge. That which we beleive to be a priori is merely the result of our brain structure which is itself the a posteriori result of our ancestry.