Who was the Macedonian leader who expanded the Empire as far as the Indus River Valley

Which was the cause of the rise of the persian empire?

The holocaust of world war ii resulted in a) the nazis effectively used propaganda to gain and hold power in germany. b) ethnic regimes carried out mass devastation. c) deporting all european jews to the island of madagascar. d) the systematic mass slaughter of european jews and and others in nazi concentration camps during world war ii.

What is the difference between an independent and a dependent variable?