PBS
Pbs Learning Media: Jaws and Teeth of Mammals
This image from Biology by Kenneth R. Miller and Joseph Levine illustrates the relationship between structure and function by comparing the jaws and teeth of two animals with very different ways of life: the wolf and the horse.
Howard Hughes Medical Institute
Hhmi: Biointeractive: Lactase Film With Quiz
Discover why people are lactose intolerant. Understand the genetic traits that allow some people to be lactose tolerant.
Howard Hughes Medical Institute
Hhmi: Biointeractive: Skin Color Interactive Video
Discover the evidence scientists have found to support the idea of evolving skin color. Pigments in the skin may be linked to where our ancestors lived.