This document discusses plants and animals that were introduced between the Americas and Europe as a result of Christopher Columbus' voyages of discovery. It notes that potatoes, cacao, and orchids originated in America but were unknown in Spain before 1492, while horses were brought from Spain to America. Additionally, caiman are native to America, Galapagos seals were discovered there, sugarcane was carried to America by Columbus, and tobacco became known in Europe after 1492.