The answer is b trust its right if u dont think its right
Answer:
Explanation:
Several advances in science and technology led to lower death rates in 18th century Europe and North America:
New scientific knowledge of the causes of disease led to improved water supplies, sewers, and personal hygiene.
Better farming techniques and machines increased the food supply.
The Industrial Revolution of the 1800s led to new sources of energy, such as coal and electricity. This increased the efficiency of the new agricultural machines. It also led to train transport, which improved the distribution of food.
For all these reasons, death rates fell, especially in children. This allowed many more children to survive to adulthood, so birth rates increased. As the gap between birth and death rates widened, the human population grew faster.
With better food and less chance of disease, the death rate fell. More children lived long enough to reach adulthood and have children of their own
Otrar-- located in central Asia, north of the Indian peninsula.
Genghis Khan organized and led the Mongols through an Asian conquest in the 13th century. After conquering China, the Mongols moved west taking over central and western Asia. The city of Otrar was conquered in 1219, four years after the conquest of what is now Beijing. The city held on in defense for months but eventually fell with the leadership surrendering.
Ronald Reagan was largely known to be an anti-communist and a fierce Cold Warrior, but he also took a big role in ending the Cold War.
Despite that Reagan took a policy called Reagan Doctrine, that was a policy to weaken the Soviet Union by aiding anti-communist resistance movements and manipulating governments in a series of places such as Asia and Africa.
With this series of movements, Reagan was able to weaken the Soviet Union by forcing them to invest in military and increasing social and economic problems internally. With that, Reagan found in Gorbachev a good ally and signed the nuclear arms reductions agreement ending the Cold War.
