What is the “Theory of Evolution”?
Here is a definition from a website entitled “Understanding Evolution for Teachers”, a collaborative project of the University of California Museum of Paleontology and the National Center for Science Education  (an organization devoted to keeping evolution and climate science in public school science education). 
The central idea of biological evolution is that all life on Earth shares a common ancestor, just as you and your cousins share a common grandmother.
Through the process of descent with modification, the common ancestor of life on Earth gave rise to the fantastic diversity that we see documented in the fossil record and around us today. Evolution means that we’re all distant cousins: humans and oak trees, hummingbirds and whales. 
So, according to the Theory of Evolution, all life started with a single life form. As that original life form reproduced, and then as its descendants reproduced, evolutionary processes resulted in the development of every imaginable form of life that exists today – from microscopic living organisms, to every kind of animal, to human beings. All from one unidentified common ancestor.
The purpose of this series of articles will be to show that this is not the most plausible explanation for how we got here.
“Give me five good reasons why my Grandpa wasn’t an ape!”
- “Understanding Evolution for Teachers: Credits”. n.d. http://evolution.berkeley.edu/evosite/credits.shtml (accessed July 2, 2012).
- “National Center for Science Education”. Jan. 2012. http://ncse.com/about (accessed July 2, 2012).
- “Understanding Evolution for Teachers: An Introduction to Evolution”. n.d. http://evolution.berkeley.edu/evosite/evo101/IIntro.shtml (accessed July 2, 2012).