The antibiotic penicillin was used to treat those sick with the black death. true false user: who belonged to the french bourgeoisie? the peasantry the middle class the nobility the monarch

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the dependent variable in galileo's experiment?