gunpowder
The invention of gunpowder.
This period is also known as the medieval period and is known for the various discoveries and inventions made during this age.
Answer: A.
Explanation: when the fall of fall of the Byzantine Empire in 1453 was over, the Russian Orthodox Church evolved into a semi-independent branch of Eastern Christianity. In 1589 the metropolitan of Moscow received the title of patriarch.
The answer is B. He knows the right person
<span>-satisfy the demands of competing nationalities.</span>
