Answer:
A civilization is a complex culture in which large numbers of human beings share a number of common elements. Historians have identified the basic characteristics of civilizations. Six of the most important characteristics are: cities, government, religion, social structure, writing and art.
Explanation:
Global warming "<span>B. threatens polar ecosystems". All the other answers are false, especially answer A. There is a lot that can be done to stop global warming, such as reducing energy consumption.</span>
