<em><u>In the 3rd Century BC, Archimedes: invented</u></em><em><u> </u></em><em><u>the sciences of mechanics and hydrostatics.discovered the laws of levers and pulleys, which allow us to move heavy objects using small forces. invented one of the most fundamental concepts of physics – the center of gravity.</u></em>
The answer is: D. She told him to follow his calling, and she became he first convert to Islam.
Khadija is mostly known as the first wife of Muhammad. Because she is the person to convert to islam, she is regarded by Muslims as the "mother of believers". It is also stated that She is the wife who Muhammad confided with the most compared to the other wives.
Continental System, buddy. Look it up