If a trait in a population is a result of natural selection, all but one of the following conditions must be met. that is :
a. the trait is heritable
b. the trait is functional
c. the trait increases fitness
d. the trait is the result of mutation

D

Explanation:

mutation would not be met because traits are hertable and they do increase fitness depending on which trait you have but they are also functional and they do on mutate they are pass on

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c. establishing proper sleep hygiene