Who is highest ranking member of the u. s. senate when the vice president is absent?

Which of the following was not an organization during the civil rights movement in the 1960s

How does a comet change when it comes close to the sun

Which act of the conquistador pizarro was crucial in overthrowing the inca? a. the destruction of the ancient inca city, machu picchu b. the siege of the inca capital near the cuzco valley c. the execution of the last inca ruler, atahualpa d. the unexpected deaths of 3 million inca warriors e. the murder of former inca emperor, huascar