Answer:
THE ANWSER IS B
115
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Explanation:
Answer: A primary positive effect of the Columbian Exchange is increased food supply of both the Old World and the New World. Various crops such as wheat, barley, and rye, were introduced by Columbus and his followers.
Explanation:
Cyanosis is not likely a clinical manifestation of a tuberculosis infection.
Typical manifestations of tuberculosis include low grade fever, night chills, cough. It is a bacterial infection which spreads through inhaling tiny droplets from sneeze of an infected person.
Tuberculosis generally affects the lungs but can affect other area of the bodies such as abdomen, bones and nervous system.
The other symptoms may include chest pain, coughing up blood, weight loss and weakness.
Learn more about tuberculosis here:
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Answer: B. Annual river floods replaced the soil, which improved the crops.
Explanation: Annual floods enriched the soil by dragging nutrients through the water, improving and speeding the growth of crops.
