European Exploration: Decreased number of plant/animal species in the world, Native Americans died because of exposure to unfamiliar diseases (smallpox, mumps, typhus, etc)- Led to population decrease, deaths of Inca and Aztecs led to war-> led to more disease, starvation (not enough people left to grow food), Venereal Syphilis: Only disease that went from New World to Old World-, animals (pigs, cows, horses, etc) TO New World- remade food supply, largest animal before Europeans came was the llama-, Plants FROM New World- Tomatoes, chilies, corn, beans, potatoes, avocados, peanuts, etc, no pizza before Columbian Exchange, led to greatest population increase in history (doubled between 1650 and 1850), grew in soils useless for other plants