I think that's a very important clarification, because we may look around and see very diverse population with very diverse handicaps - from mental to physical, and question how it could be that "survival of the fittest" let all this happen.
Information is also organized really well - short paragraphs, easy to consume, with links to more details in some sections. Target audience is probably someone who wants a few questions answered, but not a creationist or a biology scientist.