<span>Harsh heat conditions in the desert allow animals to adapt. Salt glands in animals have salt glands which helps them reduce water loss. Desert animals secrete salt instead of secreting water or sweat. They cannot allow to risk losing the water left in their bodies.
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A population of organisms must exist. There must be variation among the members of the population. There must be a mechanism by which some members of the population can produce more offspring than other members. There must be a mechanism by which the variation among members of the population is passed on to their offspring.
75% of their children will have the recessive trait.
Allosterically is your answer