Trade-offs create opportunity costs. The thing you don't choose when you make a trade-off is your opportunity cost
Southern land owners replaced it with sharecropping.
The Principle of Cross-Cutting tells us that a fault must be older than the rock it cuts. Cross-cutting in geology was formulated by Nicolas Steno, a Danish geologist in the mid-1600's. It is usually used in combination with radiometric age dating, which can tell the geologist how old the rock is.
That's a simple part of evolution. Humans are built to adapt.
If we go in the frozen tundra, we make coats and other cold-blocking clothes. We find nearby food, like fish. Over time, our differences become more distinct from the rest, and we become less vulnerable to the cold.
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A. the rich land by the river because the soil is the best for plant growth
