PBS
Tracing Ancestry With Mt Dna
The most common mtDNA ancestor is an African woman named African "Eve" or Mitochondrial Eve. Good explanation of mtDNA versus nuclear DNA through visual interactive family tree.
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,...
Khan Academy
Khan Academy: Answers to Exploration Questions: What Is a Dinosaur?
Do you know what a dinosaur is? This site has answers to the exploration questions about dinosaurs and a common ancestors.
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.