Answer: INTENSIFICATION OF FUNCTION
Explanation: Intensification of function is a term used to describe the evolutionary change that takes place in the adaption or functions of an organism without creating another organ or anything new.
When a organism's eyes have been known to not be able to see objects as far as 50meters later starts seeing very distant object without any known factor is known as INTENSIFICATION OF FUNCTION. Most living organisms experience some forms of Intensification of function during their life cycle.