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

Question

Quizplus · Accepted Answer

The reaction range refers to the potential range of expression of a hereditary trait, given the environmental conditions. In this case, the average height of adults in Western countries has likely reached the upper end of their genetic potential or reaction range, meaning that changes in environmental factors such as nutrition or healthcare may not significantly impact their height. Therefore, C is the best choice.

In the Past Few Decades, the Average Height of Adults