Question 10 (2 points) After completing 10 years of experimentation, a scientist reports a new scientific theory explaining the movement of sand on beaches. How do you know that this information is valid? (2 points)

a
There were too few years of data.

b
The initial hypothesis was incorrect.

c
The problem was not important enough.

d
Theories develop through repeated experimentation.

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: