Leaders are greedy for more power and land, a large population requires more food, neighbors are becoming to strong
Tundras and deserts have a number of similarities such as their lack of water or how organisms that inhabit them are have special features to survive their extreme weather. Both are nearly unsustainable for human life and have just like the tundra, deserts have freezing temperatures at night.
It would be a population density map
The Amazon and the Mississippi river similarities is Both played a role in the development of civilization. Both are key players in the surrounding ecosystems.<span>
Hope this answer your question! :)</span>
