Answer:
(i used both noun and verb for silt)
polytheistic - They needed to become polytheistic in order for the Egyptians to except them into their religion.
(1 noun) <em>silt</em> - There was a lot of silt in the river and it got clogged by the end of the month.
(2 verb) <em>silt</em> - The river had to get silted in order to carry the correct amount of water.
The Romans used the Arch and Dome for buildings mostly, for example the aqueducts.
<span>Karl Marx was a German philosopher and revolutionary socialist Karl Marx published The Communist Manifesto and Das Kapital, anticapitalist works that form the basis of Marxism.
Marxism is </span><span>the political and economic theories of Karl Marx and Friedrich Engels, later developed by their followers to form the basis for the theory and practice of communism.</span>