Refer to the figure.
The RNE (relative neighbor effect) measures growth of a target plant species in the presence and absence of neighboring species. The figure shows graphs of the RNE at eleven sites around the world. RNE was measured at high and at low elevations at each site. RNE values above zero (blue) indicate that neighboring plants increased the growth of target species; RNE values below zero (red) indicate that neighbors decreased target species growth.
-This study showed that the presence of neighboring plants most often benefited the target plants at

Question

Refer to the figure.
 The RNE (relative neighbor effect) measures growth of a target plant species in the presence and absence of neighboring species. The figure shows graphs of the RNE at eleven sites around the world. RNE was measured at high and at low elevations at each site. RNE values above zero (blue) indicate that neighboring plants increased the growth of target species; RNE values below zero (red) indicate that neighbors decreased target species growth. 
-This study showed that the presence of neighboring plants most often benefited the target plants at

Quizplus · Accepted Answer

High-elevation sites often have harsher environmental conditions, where the presence of neighboring plants can provide benefits such as protection from wind and cold, leading to a positive effect on target plants.

Refer to the Figure