The river flowed one way while the wind blew the other way which made sailing easier. If you wanted to go upstream you lowered the sails. If you wanted to go downstream you raised the sails
B. the transfer of peoples, diseases, plants, and animals between the New and Old Worlds
<span>The Columbian Exchange involves the transatlantic exchange of plants, animals, and diseases that occurred after the first European contact with the Americas.</span>
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Where's the picture?, you need to put a picture so people can answer your question.