To save: right-click (Windows) or control-click (Mac) on the image and select "Save image."

Fitness Image caption: Evolution shows that, as much as possible, organisms will evolve to optimize their fitness — the number of descendents they produce for future generations relative to other organisms. So based on evolutionary theory, we would expect organisms to evolve adaptations that would allow them to have more children, grand children, great-grandchildren, and so on. << Back to search results

Image credit:
If you use this image in your own non-commercial project please credit it to the University of California Museum of Paleontology's Understanding Evolution (http://evolution.berkeley.edu).