Question
The tundra ecosystem of Alaska is known as a cold desert." It receives very little precipitation, about four inches
annually. However, it is rich in wetlands due to permafrost, which traps moisture close to the surface. The
temperatures vary widely, also producing persistent winds. Although treeless, the Arctic tundra is an abundant
ecosystem. Many organisms find their niche here including many migratory bird species and mammals such as
caribou, foxes, bears, and small rodents. Which factor of the tundra ecosystem is biotic?
wind
• dead bird
carbon dioxide
temperature
Answer
Biotic factor of the tundra ecosystem: migratory bird species, caribou, foxes, bears, and small rodents.