What has boosted the czech republic's economic development? crop production energy resources foreign investment oil deposits

The lifeguard at the local beach record the tides each day the chart below shows the high and low tides over two days

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.

What period of history refers to the time when people did not have written records