In social experiments Location, age of patient or test subject, time of day, and gender of either party can play a big role in results and when changed alter the results making them dependent.
The majority of Equatorial Africa is dominated by tropical rainforests. This region receives anywhere from 100 to 500 centimeters of rainfall annually. Temperatures average about 90 degrees each day in the equatorial parts of this region.
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The control of malaria was vital for the construction of the Panama Canal. The discovery by Major Ronald Ross that malaria was transmitted by mosquitoes had tremendous impact on development programs in the tropics
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