Is this a run-on sentence?
On average, office workers spend more than five hours sitting at their desks, researchers believe that extended periods of sitting can have a negative impact on overall health.

Understand that amassed in paragraph 3 means

Which two pieces of evidence support the idea that coal is underutilized? this was on study island about coal

What does jack’s confusion suggest about the rules that govern victorian society? if a rule exists, it must exist for a very important reason. rules are a necessary part of any respectable society. rules are very difficult to change once they are established. if the rule can easily be changed, then it is meaningless.