physiology assignment help please

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To survive in the desert, organisms need to conserve much more water than do organisms that live in grasslands. Water is removed from the collecting duct as it passes through the concentration gradient set up in the medulla. The longer the loop of Henle and the longer the collecting duct, the greater the potential to remove water from the urine. As a result, you would expect the kidney of a mammal that evolved to live in the desert to have longer loops of Henle and longer collecting ducts than the kidney of a mammal that evolved in a more temperate region.