(a) Biodiversity: The variety of living organisms in a particular habitat or the entire Earth.
(b) Classification: The process of grouping organisms based on similarities and differences.
(c) Taxonomy: The science of naming, defining, and classifying organisms.
(d) Systematics: The study of biological diversity and evolutionary relationships among organisms.
(e) Taxa: The hierarchical categories in biological classification, such as kingdom, phylum, class, etc.
(f) Domain: The highest taxonomic rank in classification, dividing life into three broad groups: Bacteria, Archaea, and Eukarya.
(g) Species: A group of organisms capable of interbreeding and producing fertile offspring.