Natural Selection is the process by which organisms (plants and animals) that are better adapted to their environmental conditions will survive . These organisms have traits that better enable them to adjust to specific environmental pressures, changes in climate or competition for food or mates over time. These survivors tend to produce more offspring to those organisms less well adapted. So the characteristics of the population change over time.
This is a tautology, or truism, because a population that survives will contain the most fit. Natural selection however explains nothing about the cause of changes within an organisms genes. Even so it is used as a generic term to explain any and every structure, system or behavior of organisms.
This is a tautology, or truism, because a population that survives will contain the most fit. Natural selection however explains nothing about the cause of changes within an organisms genes. Even so it is used as a generic term to explain any and every structure, system or behavior of organisms.