Definition. Rickets (in children) and osteomalacia (in adults) are two forms of a metabolic bone disease resulting from vitamin D deficiency. Both cause softening and weakening of bones because of defective or inadequate bone mineralization. Rickets. Copyright Â© Nucleus Medical Media, Inc.
The flow from west to east: Disease. In terms of diseases, the Columbian Exchange was a wildly unequal affair, and the Americas got the worst of it. The flow of disease from the Americas eastward into Eurasia and Africa was either trivial or consisted of a single important infection.
As you can see there were many good things traded int the Columbian Exchange. Bad things that were traded was disease. Now disease wasn't traded on purpose, but it still got traded in a way.Other bad things that were trades accidentally was pests. Pests are rodents and bugs like roaches and rats.