The correct answers are:
-New tools made it possible for more crops to be grown.
The Neolithic revolution consisted in the first radical transformation of human lifestyle, which passed from being nomad, based on a hunting and gathering economy, to a sedentary and agriculture-based economy. This process started approximately 10 thousand years ago and it was a direct result of the development of new tools thanks to the new technique of polishing stone.
-Crop rotation was invented, making it harder on soil.
There is evidence that crop rotation was practiced during this period, mainly among Middle Eastern farmers. This practice allows to maintain a productive soil.
-Farmers learned to control water through wells and canals.
In order to keep the crops hydrated, ancient farmers learned how to control and canalize water courses to their plantations.