In the past few decades,the average height of adults in Western countries has not changed much.This indicates that adult height for these countries has reached the upper boundary of their ____.

Question

Quizplus · Accepted Answer

The upper boundary of one's height is determined by their genes, but environmental factors can affect where within that range they fall. This range of potential heights is known as the reaction range. The fact that the average height in Western countries has not changed much in recent decades suggests that the population has largely reached the upper boundary of their reaction range, meaning that further increases in height are not likely due to environmental factors such as nutrition.

In the Past Few Decades,the Average Height of Adults in Western