Dec 2, 2025 · taxonomy, in a broad sense the science of classification, but more strictly the classification of living and extinct organisms—i.e., biological classification. The term is derived from the Greek …

Organisms are classified in a phylum or division based largely on general body plan. For example, members of the Phylum Arthropoda have external skeletons, segmented bodies, and jointed legs. …

Dec 2, 2025 · Even when only mere fragments are dealt with, a classification of some sort may still be necessary. Large numbers of leaves, some stems, trunks or roots, many seeds, and few flowers are …

Dec 10, 2025 · Although a number of classification schemes have been devised for carbohydrates, the division into four major groups— monosaccharides, disaccharides, oligosaccharides, and …

Jan 10, 2026 · In the late 1970s American microbiologist Carl Woese pioneered a major change in classification by placing all organisms into three domains—Eukarya, Bacteria (originally called …

Dec 22, 2025 · mammal, (class Mammalia), any member of the group of vertebrate animals in which the young are nourished with milk from special mammary glands of the mother. In addition to these …

Jan 6, 2026 · This folio volume of only 11 pages presented a hierarchical classification, or taxonomy, of the three kingdoms of nature: stones, plants, and animals. Each kingdom was subdivided into …

6 days ago · In the United States, narcotics are regulated under the Controlled Substances Act, which established a classification system with five schedules to identify drugs based on their potential for …

Dec 17, 2025 · This article therefore concentrates on the biology of these comparatively well-characterized protozoans. At the end of this article is a summary of the contemporary protistan …

Dec 1, 2025 · social class, a group of people within a society who possess the same socioeconomic status. Besides being important in social theory, the concept of class as a collection of individuals …