Answer: Exchange of plant and animal species, but also certain negative phenomena.
Explanation:
With Europeans' arrival on the soil of North America, there was an exchange of certain plant and animal cultures. However, that contact also had negative connotations. Europeans also brought certain infectious diseases such as the flu and smallpox to which the natives did not have a developed immune system. These diseases have decimated, in some cases, the entire tribal communities of North America.
When we talk about exchanges of plant and animal species, Europeans took over potatoes, tobacco, tomatoes, corn, and some other crops from the natives. On the other hand, the natives got acquainted with wheat, onions, and pigs, and horses.
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As what the map shows, one of the geographical features of West Africa is the Sahara Desert. Sahara Desert is the largest hot desert in the world. Camel caravans are important innovation in trade in West Africa because camels are the only animals that can withstand the hot temperature of the desert while carrying goods, and without food and water. The fat in the camels' humps gave them the energy to walk the desert even without food and water. The camel caravans made the West - North Africa trade possible, establishing trade routes across the hot desert.
