The Columbian Exchange has brought new species to Europe. This includes new plant species, such as tomatoes and potatoes which have help combat hunger in Europe. This can be seen for example through the fact that when potato has a blight it caused the great famine in Ireland. However, the Columbian Exchange was not only positive for Europe as it also introduced sicknesses such as syphilis.
<span>A . The United States entered World War II. is the answer</span>
Explanation:
refers to better conditions for farm workers
I believe the answer is: <span>formal operational
During </span>formal operational stage, most people would started to develop the ability to develop abstract concept which granted us the ability to create a hypothesis. On average, <span>formal operational stage happen when we're around 12 years old or older.</span>
