What was a major contributor to unrest in nigeria?

 The correct answer is :  its many ethnicities and religions

Explanation: The large numbers of casualties during the civil war in Nigeria were attributed to the many different factions at war with one another. When military leaders and dictators ruled Nigeria they avoided the riots by prohibiting any criticism of the government.

the rebels’ chances of victory at lexington & concord were fairly slim, given the fact that most of them very untrained and they were up against the world's greatest military force.  

answer; researchers typically cannot control people's sexual behaviors as would be necessary in an experiment;