Remember that, as a rule, temperatures decrease with altitude. If you were studying the effects of climate change on the geographic ranges of species living in the mountains and your climate records showed that mean temperatures were increasing, you would predict that species ranges would show a shift toward:

Higher elevations

Explanation:

plant species shift their ranges in altitude and latitude as a response to changing regional climate. For plant species to successful colonize a place they prefer a warmer temperatures and well-developed soils. Hence when the mean temperature range us high they tend to shift to a more favorable place(Higher elevations) for optimum growth and distribution.