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 is the same as selective breeding, except that the selecting of genes is done by nature, rather than by people. For example, Arctic wolves live in. the very cold climate beyond the Arctic circle. They have. thick coats, small, round ears and short legs so they donât. lose body heat.