a doctor who administers agents that cause loss of sensation during surgery anasthesiologist a doctor specializes in treatment of disease using high-energy radiation
The word phylum (plural: phyla) is a category used to classify marine organisms. In this article, you can learn the definition of phylum, how it is used, and examples of phyla used to categorize marine life.
The nine largest phyla contain the majority of species. One phyla, the arthropods, which includes insects and spiders, constitutes about 75 percent of all known animal species. More than 900,000 arthropods have been described, and according to some estimates there may be more than five million more.