Which civilization lived in elaborate cliff dwellings?

The federal goveremnt ability to draft people into the army is?

Which of the follow modern activities would only have been possible after the neolithic revolution

Consider the events in alfred wegener's life that led to his development of the continental drift hypothesis. review the items below and determine whether each item is (1) an observation that led alfred wegener to develop his continental drift hypothesis, or (2) evidence wegener gathered to support his proposal.