Is war ever necessary? Why? Why not?

No, the war isn't necessary because it cause a lot of people to get hurt and or killed. It also never solves or ens anything. When one side wins the other side feels the need to get back at the winning side and this goes on back and forth caue no one wants to be the losing country!

How did European exploration and colonization forever change the landscape and lives of people in the Old World and the New World?

European exploration and colonization forever change the landscape and lives of people in the Old World and the New World through positive and negative affects. Some positive effects it had on the change were new foods, less hunger, more protien, inroducing of livestock, and new cultures. On the flip side there are also some negative effects as well. Such as weight gain, diseases, lead to enslavement, and distroyin of the Native American and African cultures.