Concept:The camel’s key desert adaptation is its ability to survive severe water loss.Explanation:A camel can lose a large percentage of its body water and still remain healthy.It does not increase sweating or produce large amounts of urine in the heat.Instead, it conserves water and tolerates a high degree of dehydration.This physiological feature enables it to travel long distances without drinking.Therefore, the best choice is the ability to tolerate high degree of dehydration.Answer:D. ability to tolerate high degree of dehydration