Read the passage. There are many farms that only grow pine trees. In the spring, seedlings are planted in rows that are ten feet apart. After fou
years, one-third of the trees are removed to give the others more room. Two or three years after that, another one-third are remove
other year the lower branches are cut away so that the trees' growth goes up and not out. Depending on the climate of the region, t
harvested when they are between 20 and 35 years of age.
What is the main structure used in the passage?
O 1. chronology
2. comparison
3. cause and effect
4. problem and solution
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