Based on the information in the graph, what can you conclude about humans in the world in general?

The vegetation that thrives in the tundra is limited to a. mosses, barley, wheat, and corn. b. coniferous trees. c. dwarf shrubs, mosses, lichen, potatoes, and beans. d. mosses, lichen, algae, and dwarf shrubs.

Which barrier to economic development is shown in the following examples?

How does the use of fertilizers impact the environment?