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

amber has allowed scientists to study dna that has been preserved over millions of years.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.