Alphabetical listing from the University of California of info on each of the animal phyla. Includes scientific and common names and photos. Characteristics of each group are explained in detail.

A good site to begin your study of grasslands as it gives clear definitions of terms and an explanation of how the grasslands came into existence.

Robert T. Bakker, paleontologist.

Discover the accuracy of dating methods and fossils because of the scientific approach used.

A concise site that describes the four basic features that all chordates share.

"The survivals and extinctions at the close of the Cretaceous are such as might be expected to result from intensely hot winds such as would be generated by extra large meteoritic impacts." This article suggests that this theory should...