Instead, a few of these issues are highlighted below, specifically in the context of taxonomic and phylogenic obstacles: ancestry, variation, and biological complexity. Among fossils, variation ...

Under the most widely used system of biological classification, known as the Linnean system, every taxon is then put into a hierarchy based on its taxonomic rank. The lowest level of ranking is ...

Our key is designed to be used with algal cultures from the Carolina Biological Supply Company ... terminology to further familiarize students with the morphology and taxonomy of the algae. The ...

During reviews for listing, the Center for Biological Diversity has withdrawn more than 100 previously petitioned species due to updated information on species’ taxonomy or status. More broadly, ...

From this evolutionary perspective, biological anthropologists study ... Some articles highlight individual taxonomic groups, such as the earliest fossil apes or the enigmatic Plesiadapiformes ...

at all levels of biological organization--from genes and genomes to populations and species--change over time. Research that characterizes and classifies biodiversity on planet earth, describes and ...