Question 13 1 pts 13. each year there are close to billion trees planted in the united states o six o five o two o one question 14 1 pts 14. the reason certain types of trees dominate a region is because of a natural process called wildlife o succession o overstory o deciduous question 15 1 pts 15. an area where all living and nonliving features depend on each other is called an o preservation o industry o axygen system o ecosystem

The investiture controversy began as a power struggle between pope gregory vii (1072–85) and henry iv, holy roman emperor (1056–1106).[2] a brief but significant struggle over investiture also occurred between henry i of england and pope paschal ii in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in france, as well.by undercutting the imperial power established by the salian emperors, the controversy led to nearly 50 years of civil war in germany, and the triumph of the great dukes and abbots. imperial power was finally re-established under the hohenstaufen dynasty. historian norman cantor:

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According to new research, more than 5..5 million deaths are associated with polluted air. hope this : ).

The saharan africa is desert not forest