The correct options are
B Transport of plants and animals
C Spread of diseases
D Exchanging culture
The movement of plants, animals, technology, culture and strange diseases between the America and Europe as a result of the conquest of America by the European colonial powers was called the Columbian Exchange. From America, plants like maize, potatoes, sweet potatoes, and cocoa, and animals like turkey and guinea pigs were transported to Europe. Sugarcane, rice, horses, cattle, and goats were transported to America from Europe. Apart from these items, Europe also brought deadly diseases like chickenpox, measles, typhus, and malaria to America, against which the natives of America were defenceless and this almost led to their extinction.