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

Look at this dictionary entry: realize (ree-uh-lyz) v. to become completely aware of (something) as a fact; understand without a doubt to make (something desired or anticipated) occur to give real, definite or physical form to a plan, dream, or goal to earn (money or a profit) from a deal which sentence uses the word realize as it is described in the fourth definition? a. mike realized the gravity of the situation only when dalia explained it to him. b. only hard work and perseverance can people realize their dreams. c. he felt that his vision was realized when he finished reading the final draft of the narrative. d. fay's glass paintings are expected to realize a handsome profit. e. dan will realize his goal of going to an ivy league school only if he works hard.