Taxonomy is best defined by which of the following phrases? a. the study of the digestive system. b. a group of archaeans that live in deep-sea trenches. c. the process by which a platform obtains energy. d. the science of classification.

The science of classifying living things is called taxonomy. In the taxonomy organisms are grouped on the basis of their characteristics, phyogenetic relation and history of evolution. Taxonomy is a part of systematics which provides description, identification, nomenclature and classification. Thus, taxonomy is the science of classification.

D. the science of classification