About 3,000 union women served as battlefield nurses during the war. though they couldn't join the military and often worked without pay, their services were necessary because

If not for the women a lot of things could have gone badly for the United States. Women helped in ways that men could not. They knew that if they didn't step in that the United States would have lost the battle because they saved hundreds of men's lives by just helping the wounded on the battlefield. They also did many other things that would help the men out through the rest of the war.

the period of human evolution has coincided with environmental change, including ('hominin' refers to any bipedal species closely related to humans – that is, on how do we know earth's climate has changed? a map showing dates and locations of prehistoric archeological sites and migration routes from africa into.