What was a positive effect of the colombian exchange

The primary positive effect of the Columbian exchange was increased food supply and nutrients to the populations of both areas.

the answer is hope this you.

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.