Diseases introduced by the Columbian Exchange caused a sharp decline in population levels in the Americas beginning in the 15th century. The correct option among all the options given in the question is option "C". The natives never faced the diseases that attacked them and so they did not have any cure for them. <span />
To prevent a war in Germany but also to appease Hitler
One very famous, perhaps the most famous way was through improvised vaccination. Specifically, George Washington ordered his healthy men to be injected with substance taken from the wounds of the sick men during a smallpox infection.
A risk was that those men would get sick just like the the sick men did, but the the potential reward would be that they would get sick in a controlled way and that they would be able to fight this disease.
Answer:
The answer is D
Explanation:
Being in a valley results in air pollution being contained to an area.
Answer:
Aristotle says when actions appear useful either as ends or as means to an end in light of any of the previously named goods, they are performed for that purpose, furthermore Aristotle points out that actions should be guided by set goals in order to attain personal objectives.