Walmart assistant managers average $45,000 a year, which is right on target for the national average salary, according to Glassdoor salary data. If you factor in bonuses and additional compensation, the average pay increases to $48, 311 a year.
Natural selection can only work on existing variation within a population. Such variations arise by mutation, a change in some part of the genetic code for a trait. Mutations arise by chance and without foresight for the potential advantage or disadvantage of the mutation.
Natural selection looks for the best traits to fit the current environment of a species. Now, natural selection does not directly cause an adaptation. This is how it works: if â¦ a mutation causes a species to produce more surviving offspring that inherit that trait, than many many many generations down the line it would be considered an adaptation.