This document discusses the overseas diffusion of plants and animals before 1492. It provides evidence from sculptures and depictions in art from locations like India and Mexico that maize, sunflowers, peanuts, and other crops originated in the Americas but were grown and depicted in other parts of the world prior to European contact. The document also discusses unintentional transfers of organisms like rats, cats, and grain pests between continents in ancient times. It concludes by encouraging further research on this topic by students.