Steam Engine,eletricity and assembly line.
The main one was that they all followed the same religion, which then unified them.
Another one was they were really accepting, they didn't do racism, or judge people by status,. Every one was free.
Finally, the laws and knowledge the Muslims had. The knowledge was at a great extent, especially in Spain and Africa. The first street lamps, airplanes, camera, and safe were made in the Muslim World. Algebra as well!
I'm saying this through research and visits to museums from elementary school.
<span>The is: A.The bravery of the Tuskegee Airmen during World War II combat was instrumental in securing racial integration of the US military.
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It would be possible for Europa to harbon very alien-like specific microbic life which we haven't had the chance of encountering before. The reason would mostly be because it has a liquid present but that liquid of course is not water. It would probably also use