Which scientific discipline is correctly matched to a contribution to society? biology; theory of relativity geology; theory of continental drift ecology; discovering new elements astronomy; developing quantum mechanics

Trench warfare began after germany failed in its initial plan to seize france and bring a quick end to the war. negotiate a temporary truce with the allied forces. attack the allies by sea with its powerful navy. storm across the eastern front to attack russia.

Is this statement true or false? before 1850, workers in american mines, mills, and factories were poorly paid, but their safety on the job was always protected by strict laws.

In ohio in 1872, the cleveland massacre was a violent labor dispute at standard oil refineries in cleveland. a takeover by standard oil of the refineries in cleveland. an attempt to stop standard oil from becoming a monopoly. a failed attempt by standard oil to take over other refineries.