Which items in the list are secondary sources a historian could use to contextualize why a political revolution occurred in egypt in 2011

The correct answer is alternative D) II and III.

II and III are secondary sources of information, since they weren't written by a witness of the events.

I and IV are primary sources of information, since they were made in the period of the event, by witnesses of the event.

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.

giant bugs

explanation: