There are millions of different types of living things on Earth. In order to keep track of them all, scientists put living things into groups based on characteristics that they have that are the same.

The water-to-land transition stands as one of the most significant events in vertebrate evolution, giving rise to the two major groups of living land vertebrates-amniotes and lissamphibians-which ...

Dedication to William Buckland / Christopher J. Duffin -- Introduction. Vertebrate coprolite studies : status and prospectus / Adrian P. Hunt ... [et al.] -- History of study. The earliest published ...