Question

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 __________.

Answer 1

Reaction range

Step-by-step explanation:

The reaction range is when the phenotype (the characteristics an organism expresses and are visible) of an individual is dependent on its genetics and the environment, this means that the height is being limited by genetics and te environment.

I hope you find this information useful and interesting! Good luck!