Whats the study of how humands impact the environment called?

Josh is teaching michael how to be an effective speaker. what two general hints for effective informative speaking should josh share?

In at least two paragraphs, discuss the differences between the principles of republicanism and democracy. explain whether you think the united states is more of a republic or a democracy. refer to at least one example from the constitution

1u.s. history question! question: how did world war ii change the united states' position in world affairs? i need good explanation to support the answer otherwise i get docked points. real answers only ! you! : )