Answer: ill try to answer this
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Image result for What was the "Three Field System" and how did it revolutionize European agriculture?
The three-field system let farmers plant more crops and therefore increase production. ... Crop assignments were rotated every year, so each field segment would be planted for two out of every three years. Previously a "two field system" had been in place, with half the land being left fallow.
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I think cloning in my opinion is not OK because when somethings wrong with the experiment just my opinion
When JFK was president, the Democrats held a big majority in both the House and Senate. But he couldn't get Congress to approve his proposals to enlarge civil rights, supply federal aid for school construction, create a Department of Urban Affairs and Housing, or establish a program of subsidized medical care for the elderly. During JFK's last year, Congress passed 1/4 of his proposals. When Carter had a majority of Democrats, many of his most important proposals were defeated or greatly modified.