What's the definition of absolute chronology?

Which four of these developments were made under mongol rule during the pax mongolica? the extension of the grand canal in china the spread of christianity the spread of weapons that used gun powder the invention of new medicines the establishment of a postal system the invention of geometric models of lunar motion

In a command economy, people are not free toa buy consumer goods.b work in factories.c make production or monetary choices.d receive an education.

What was the final spark that ignited the “european powder keg” and started world war 1