There are many climate regions around the world. Some of them can vary from mild temperatures to very extreme ones. One of
the harshest regions is the tundra. The tundra is an area of land that has no tree growth due to its cold, windy, and dry nature
Tundras can be found in the northern parts of the globe, in the Arctic, and the tops of mountains. They have a layer of frozen ground
called permafrost, which prevents almost anything from growing in the soil. Therefore, only a few animals and plants can survive in
these conditions
The author organizes this passage by

A. defining the term tundra and describing its conditions.

B. giving the different classifications of permafrost.

C. comparing the tundra's climate to other climate regions.

D. showing the effects of very mild and extreme climates.