Answer: C) Myopia
Explanation:
Myopia is a eye condition in which light does not focus on retina of the eye which makes the sight blurry and complicated in identification of objects.This condition can develop extreme nearsightedness in which far -away thing cannot be seen properly.
According to the question,myopia can decrease while at the stage of middle adulthood as the age-related increment improves vision.
Other options are incorrect because inheriting genetically ,far-sighted and Pax6 gene are not responsible for nearsightedness in which objects seems blurry. Thus, the correct option is option(C).
The correct answer is government owned railroads
Explanation: Rail transport is carried out on railways to transport people and goods. The goods transported in this mode are of low added value and in large quantities as: ore, agricultural products, fertilizers, coal, petroleum derivatives.
Barriers keep markets from entering the market freely.