Why are secondary sources important to the study of history

Which of the following contributed most to making the items listed in the box

97 points what types of changes have been made in the united states to protect people from earthquakes? a. communities are no longer located along fault lines. b. building codes ensure that structures can withstand shaking. c. warnings go off when an earthquake is expected, and people evacuate the area. d. barriers have been built to prevent flooding by a tsunami.

What were the nuremberg laws? who did they target and how? list 3 ways people were targeted by the nazis.