The development of a farming culture among pre-Columbian Native American Indians helped ensure a more stable food supply.
<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>
Answer: Austria's leader and his wife was killed b a Serbian nationalist.
Explanation:
Manchuria is your answer :)
Which is B on plato :)