The theory of evolution explains that different organisms have their origin in other preexsiting types and the differences of their traits rely on the changes made in the next generation. Among the options provided, The 3rd option will most likely lead scientists to change or improve an existing scientific theory about evolution. Discovering a new species of reptile that has different traits than known species and fossil records. The discovery of these new species that possess a different trait will help scientist modify the present theory since a theory is open for new evidences in order to prove the truthfulness of the old theory.