Other
Plant and Animal Evolution: Homology
In this informative site, homologous is defined and the wings of birds and bats are compared to clarify the concept.
PBS
Pbs News Hour Extra: Scientists Discover Oldest Human Ancestor
Scientists have recently published their research into fossil bones from Ethiopia that they say came from an ancestor common to both humans and chimpanzees. They have named the ancestor Ardipithecus ramidus. In the articles and video,...