The greatest impact of the columbian exchange was
a) the annual storage of crops for native peoples.
b) the transport of slaves from the americas to africa.
c) the spread of new diseases, which led to vaccinations.
d) the transfer of plants, people, and ideas between the americas, europe, and africa.

the answer is 250 percent.

interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)