Darwin's Theory of Natural Selection
Natural Selection acts to preserve and accumulate minor advantageous genetic mutations. For example, if a species inherited a genetic mutation of wings that would help it survive, then its offspring would inherit those same traits(wings). That leads to the term " Survival of the Fittest". This term demonstrates how fitness denotes an individuals overall ability to pass copies of his genes on to successive generations. The very first cell seemed to have formed several billion years ago about 750 million years after earth was formed. It is hypothesized that molecules could form and spontaneously polymerize into macro- molecules. Homologous traits, such as limbs, are traits inherited by two different organisms from a common ancestor. Analogous traits, such as wings, are traits similar due to convergent evolution. A vestigial structure is a feature that is no longer necessary to an organism.