You may not park within how many feet of a fire hydrant

Bonus question: according to wikipedia, in chinese philosophy yin and yang "describes how seemingly opposite or contrary forces may actually be complementary, interconnected, and interdependent." what are some examples from the story that amy tan may have intentionally incorporated elements of yin and yang philosophy into this story? select 2.

Which factor contributed to the rise of african empires such as ghana and mali?

This refers to weather and atmospheric conditions measured over a long period of time.