What can you learn from a tree's leaves? Discover how leaf shapes, edges, patterns, and more can help you identify a tree in the forest.

Norman Pace favors this tree, arguing against prokaryote because eukaryotes, bacteria and archaea originated at the same time, he contends. Science News headlines, in your inbox.

Prokaryote: gene-sequence comparisons show the tree of life consists of bacteria, eukarya and archaea. The use of the term ‘prokaryote’ fails to recognize that an idea about life's origins has ...