Wind currents, glaciers, streams, landslides, floods, freeze-thaw and oxidation
I would say A. Along warm water currents from warmer regions to colder regions is the correct answer let me know if this helps
They lacked immunity to these diseases.
before the europeans, the american indians hadn’t come in contact with these diseases that were part of a different area of the world. as a result, many american indians died.
