4 is the correct answer.
A-D are all characteristics of civilizations. There are a few more, including arts, but the main characteristics of a civilization are a government, religion, social structure, and specialized labor.
Space travel tests started in the 50s
I believe was the frozen<span> conflicts besides the cold war that started in 1985 and ended in 1991 I mean if the frozen conflicts don't count as the last one then I THINK it is the cold war (1985-1991). :)
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Answer:
crusaders fought in the war lasted from 1095 to 1291 ce
