What was the columbian exchange between the eastern and western hemispheres what crops were taken from the americans to the eastern hemisphere?

The columbian exchange was the exchange of wealth, crops, livestock, and most importantly disease between the new and old world. foreign people came into contact with each other and lacked the needed immunity to prevent illness. some crops exchanged were squash, corn, beans, and potatoes.

Ais 190 b is 200c it can't be more then 100%