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What is the lecture mainly about?
How has the professor mainly organized her lecture?
Mother Nature has produced thousands of species of edible plants. Which of the following plants would probably NOT be feasible for dry land farming?
Which population lived for years surviving on dry land farming?
In which case can dry land farming NOT save the year’s crops?
What does the teacher mean with the phrase ‘you can’t make a silk purse out of a sow’s ear?