Technology helps in dealing with economic emergencies like food shortage and disasters. Technology is used to study the existing environmental conditions in order for farmers to be guided with the right crops to plant at specific seasons to ensure maximum yields. In terms of disasters, technology is used for disaster risk reduction and management. This is done in order to minimize the effects that disasters have on the resources.
In the study of history the available documents for studying a certain period is unchanging over time.
Option: B
Explanation:
History is the study of events and phenomena over space and time. Space means where the particular incident is taking place. Time means the period of occurrence of particular event. A certain period suppose the period of sultanate or mughal empire requires some documents, records to be studied in detail.
And these available documents, records can never be changed over time. History is study of things over changing space and time. Archaeological evidences also keep some valid documents for studying historical events.
The answer is D, a writing system
Started the creation of railroads witch helped industrial revolution happen so fast