Answer:
As the stars move across the sky each night people of the world have looked up and wondered about their place in the universe. Throughout history civilizations have developed unique systems for ordering and understanding the heavens. Babylonian and Egyptian astronomers developed systems that became the basis for Greek astronomy, while societies in the Americas, China and India developed their own.
B. is the awnser i believe glad i could help
A. knew, because if you think about how they all sound, B and C could not work, since they sound kind of weird. D sound like it could work, but only if it was "had <em>know</em><em>n</em>". Therefore the only answer left to pick is "A. knew".
