The answer is B the invention of balance made trade easier
B. historians shouldn't project modern ideas
That which is an example of a complex sentence is: As industrial robots became more common, many laborers who lacked skills lost their jobs.
A complex sentence is a sentence with one dependent clause and one independent clause.
In the sentence above, we find an example of a dependent and independent clause being used to form a complex sentence.
The first half of the sentence separated by the comma is the dependent clause while the second half is the independent clause.
Learn more about complex sentences here:
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They have the ability to kill billions of people with one atom bomb instead of one person at a time with a flintlock pistol
I would describe it as a surprise to the Germans and a very strong frontal assault and one that was the most important in the history of D-Day was the battle of Normandy beach were American troops went and stormed a beach were multiple German force leaders were and took them down.