How many countries are in the world

Why are nongovernmental organizations important? check all that applya. they are private institutions that aid the work of government.b. they often fill in gaps between government-funded services. c. they are private institutions that attack government policyd. they citizens by acting as watch dogs over elected officials

This word for a bug or malfunction was popularized in the 1962 book into orbit by the mercury astronauts

If scientists only detect p waves in a certain layer of earths interior what does that tell us?