Which of the following animal can survive without drinking water?
Correct answer: A. Kangaroo rat
- A. Kangaroo rat
- B. Pig
- C. Camel
- D. Kangaroo
Explanation
Kangaroo rats, because their habitats are hot and dry, must conserve water. They do this in part by lowering their metabolic rate, which reduces the loss of water through their skin and respiratory system. Evaporation through the skin is the major route of loss. Merriam's kangaroo rats obtain enough water from the metabolic oxidation of the seeds they eat to survive and do not need to drink water at all.
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The kidney and urinary system remove nitrogenous wastes, regulate water and ion balance, and help maintain blood pH through filtration, selective reabsorption and secretion. Questions cover nephron structure, ultrafiltration, the loop of Henle, collecting ducts, urine formation and the roles of ADH and aldosterone, while distinguishing excretion from egestion.
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