The theory that describes the way separate images viewed at regular intervals create the appearance of a continuous or single movement is called .

Persistence of vision.

Explanation:

Persistence of vision is a form of sight-related illusion that is created in mind due to uniting of various separated images into one.It gives the illusion of movement to the vision.This phenomena occurs for short duration of time .

This concept is used in multimedia ,animation movies and other motion visual fields for providing perception of motion through visuals images.

answer; the correct answer to the above statement is to increase the production of milk in a herd of milk cows, the highest producing cows were chosen as the mother;