PBS
Pbs Learning Media: Tetrapod Limbs
This illustration from Evolution by Monroe W. Strickberger shows the remarkable similarities between the bones in the forelimbs of various tetrapods, all of whose limbs serve very different functions.
Other
Devonian Times
Newspaper-formatted Devonian Times reports on the ongoing exploration and research being conducted at Red Hill, a Devonian-period fossil site located in central Pennsylvania, where an impressive array of fossilized animal and plant life...
Smithsonian Institution
National Museum of Natural History: Paleobiology: The Mississippian Period
Journey into the past while reading this comprehensive overview of the Mississippian Period that covers topics such as life in the seas, tetrapods and other life on land, fossil evidence, and climate and tectonics.
The Field Museum
Field Museum: Exhibits: Evolving Planet: Carboniferous
Explore this impressive compilation of scientific research focused on the Carboniferous Period in the late Paleozoic Era.
University of California
University of California Museum of Paleontology: Homologies
These pages are from the Understanding Evolution website for teachers. They focus on homologous structures that organisms with common ancestors share.
Other
The Evidence for Evolution: Homologous Similarities
This site is a section part of a website that accompanies "Evolution," a textbook by Mark Ridley. Here he covers homologous structures, using them as evidence for evolution.
The Field Museum
Field Museum: Exhibits: Evolving Planet: Silurian and Devonian
This informative exhibit delves into the progression of life on land, provides images of plants, fishes and creatures, and examines the development of vascular plants, fishes with jaws, and tetrapods.