Invasive species of flora and fauna and communicable diseases were a byproduct of the Colombian Exchange
The fourth alternative is correct (D).
Nations produce goods and services according to their productive capacity, their natural resources and the specialization of the workforce. In this way, some goods and services are expensive for a nation to produce, but are cheaper for other nations to produce.
Thus, if each nation specializes in the product in which it has a production advantage, nations can make tradeoffs. The country that has an advantage in the production of a good can export it to other countries and still can import the goods to which it is not specialized.
Ida Tarbell was the muckraker, she was specially known because of the status she had at time
Most of them were farmers.
