The pages are linked hierarchically, in the form of the branching evolutionary tree of life, organized cladistically. Each page contains information about one particular group of organisms and is organized according to a branched tree-like form, thus showing hypothetical relationships between different groups of organisms.
Did DNA come from viruses? Research that began with a study of replication enzymes used by bacteria has led to a controversial theory: viruses may have helped shape all three major domains of life.(NEWS)
May 12, 2006; Scientists who deal in the history of life have never been quite sure what to do with viruses. One measure of their uncertainty...