Answer:
Life became more difficult because African peoples lost economic control of their countries to Europeans.
Probably rivers and water sources, because you need water to farm, and the water by rivers is rich and the soil is good. So yea the rivers and other water sources would be the main thing.
Not sure but I think it's the 4th one
Folktales are passed down this way and Oral tradition is non written history, it is spoken. for african people this is their way of life. hope this helps