What is happening when a mass on a spring swings back and forth

What is the role of communication within groups of people with different backgrounds?

In 1866, a mob in which tennessee city attacked local african americans and burned down homes and schools?

How did economics delay scientists' first attempts for conservation in each story? describe the political actions that led to successful conservation in both stories. i have them all done but these two. none of my teachers are responding and i just need . i can show both stories.