What kinds of foliage might you find in the polar zone

In the Arctic, growing conditions for vegetation  vary greatly. In the southern parts of the Arctic, plant communities can be vigorous with small trees and stands of low growing shrubs.

The further north one travels, the shorter and more sparse the ground cover becomes until in the high Arctic, which is a true desert. Here, the plants are scattered across stony ground and the most numerous plants are the lichens. Also here the carpet of flowers are only found below bird cliffs or other areas of high fertility.

when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave