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.
Describe the theory of evolution by natural selection. Natural selection occurs when environmental conditions select for certain advantageous traits. Because traits are heritable, the traits of those who successfully reproduced are more common in the next generation. And in this way, nature selects for these traits. Evolution by natural selection is thus the change in the frequency of different alleles for a trait through time. Over time, natural selection can allow species to adapt to changing environmental conditions and diverge from one another, leading to the great diversity of form and function of organisms we observe today.