Art history: mortar was a combination of sand, lime and water used as a bonding agent in ashlar masonry (a type of construction that mostly uses rectangular blocks of stone). it was a very common in the acient world. what was the major contribuution the romans mande to the montar recipe, how did it improve builing?its due !

it was petrified wood that was used and mixed with the sand and water which turned it into a hard stone type substance

Explanation: was used in the stone age

for the 2 countries u can do china and america because america has a democratic government while china has a communist government.

a democracy is a government run by the people either by directly voting or indirectly by electing representatives. an oligarchy is a government run by a few or a small group of people. a democracy and oligarchy are similar because both in an oligarchy and an indirect democracy, a small group of induvial determine the laws for a large group of people they are different because in an oligarchy it is easier to control and they do not have to answer to a large number of people in the country, unlike a democracy where they do have to answer to a large number of people an county that is a democracy would be the united states. a country that is an oligarchy would be the china.