Adaptive Mechanisms,such as ____,Can Help Animals Live at a High

Question

Adaptive mechanisms,such as ____,can help animals live at a high elevation.  
A) carbonic acid
B) narrower blood vessels
C) highly efficient hemoglobin-oxygen binding
D) decreased nitric oxide
E) small efficient lungs

Accepted Answer

Highly efficient hemoglobin-oxygen binding allows animals to extract as much oxygen as possible from the thin air at high elevations. This is important because the lower atmospheric pressure at high elevations limits the amount of oxygen that can be taken in with each breath.