Answer:
In physical geography, tundra is a type of biome where the tree growth is hindered by low temperatures and short growing seasons. The term tundra comes through Russian (tûndra) from the Kildin meaning "uplands", "treeless mountain tract".[1] Tundra vegetation is composed of dwarf shrubs, sedges and grasses, mosses, and lichens. Scattered trees grow in some tundra regions. The ecotone (or ecological boundary region) between the tundra and the forest is known as the tree line or timberline. The tundra soil is rich in nitrogen and phosphorus.[2]
B. Embankments, packed dirt and or stacked stone placed to keep water out.
Gamma ray photons carry more energy than photons of any other wavelength.
You can't actually use the illustration to answer the question, because it doesn't say anything anywhere about energy. Still, i'm glad that you did include the illustration, and that i was able to see it, and now I can give you even more help: The illustration has several problems and outright errors. Don't spend too much time trying to learn stuff from it.
