The Arctic region is broken into three floristic zones (High, Low and Sub Arctic), referring to the amount of plant life that exists within the regions' boundaries.
根据区域边界内的植物数量,北极地区可以划分成三个植物区系(分别是高北极,低北极和次北极)。
2
The tropics boast more than 10 times as many species of animal and plant as the Arctic, with diversity decreasing steadily as you approach the poles.