Evidence for Evolution

 My favorite prediction Darwin's idea of descent with modification makes is that species are not independent, but are connected by descent from common ancestors. I think that this is one of the most important and fundamental principles of the theory of evolution. This concept can connect all living organisms to each other and be used to analyze how evolution has occurred and where species separated.

One thing I find most interesting about life is DNA and how every living thing uses DNA and/or mRNA to survive and function. The genetic code is very complex, yet works about the same in all organisms. The central dogma of biology occurs in a similar fashion in about every organism - DNA to RNA to protein. While this is very basic, I believe it says a lot about how species are connected. Sharing DNA with other organisms can explain homologous features, and how the changing of code can lead to the changing of physical features which eventually leads to speciation. 

Overall, this connection of all species is supported by the genetic code and the similarities between all organisms. This code is what has given rise to all new species through mutations and changes.

homologous structures showing the similarities between species which is explained by sharing a common ancestor

Sources

https://www.ncbi.nlm.nih.gov/Class/MLACourse/Modules/MolBioReview/central_dogma.html

https://www.khanacademy.org/science/biology/her/evolution-and-natural-selection/a/lines-of-evidence-for-evolution