Which two examples of modern military technology had the greatest impact on the course of world war 1? explain

What are new social classes emerged due to advancement in agriculture ?

Two gymnastics teams are intense rivals. the first team has started recruiting new gymnasts from different cities and even foreign countires in an effort to build a stronger team. after learning this, the secondteam begins its own recruitment campaign to find better gymnasts. over a period of months, each team recruits dozens of players, each time trying to find a better recruit than its rivals most recent addition. which idea from the cold war is most similar to this scenario

Why do many scientists suppose the land bridge theory of migration?