Which best summarizes the concept of natural selection? a. an organism will always adapt to its environment b. a mutation always makes a species fitter c. the fittest organisms survive and reproduce d. an organism will always mutate to survive

the one that best summarizes the concept of natural selection is : c. the fittest organisms survive and reproduce take girrafe for example. In the past, there were girrafes with long necks and there were girrafe with short necks. The girrafe with short necks were unfit to live in the environment where they obtain their foods from taller trees. So , only the long necked one that managed to survive and reproduce

That would be a working theory.