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

Reaction range

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.

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answer; (cognitive   dissonance);

the above statement/question is (true);