What were the three main principles of public education in the 1800's?

By the mid-1800s, most states had accepted three basic principles of public education: that school should be free and supported by taxes, that teachers should be trained and that children should be required to attend school. By 1850, many states in the North and West used Mann's ideas. Hope this helps^_^

Explanation:

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crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.

b is the answer i am assuming