Topic content:
According to the similarity between organisms, scientists divide organisms into several kingdoms, each of which is divided into six smaller levels: phylum, class, order, family, genus and species. The most basic classification unit is ()
A. Boundaries
B. Door
C. Genus
D. Species
Best answer:
Scientists divide organisms into several kingdoms according to their similarity, such as the plant kingdom, the animal kingdom, and other organisms. The biological taxonomic units from large to small are kingdoms, phyla, classes, orders, families, genera, and species. The kingdom is the largest taxonomic unit, and the most basic taxonomic unit is species. The larger the taxonomic units are, the less the similarity of organisms is, and the fewer common features are, The more biological species are included, the farther the biological kinship is; The smaller the classification unit is, the more similar the organisms are, the more common characteristics they have, the fewer biological species they contain, and the closer the biological kinship is
Therefore, D
Answer analysis:
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Test core:
Biological classification units: the main biological classification units are kingdom, phylum, class, order, family, genus and species. There are also subspecies (abbreviated as subsp.), plants and varieties (abbreviated as var.). Sometimes there are some auxiliary grades. In fact, the main classification grade terms are prefixed with super - and sub -. Sometimes, infraclass and infraorder are set respectively under subclass and suborder. Example: Taking the well-known name Felisdomesticus (domestic cat) as an example, its classification system and name are as follows: Animalia, Chordata, Vertebrata, Vertebrata, Mammalia, Mammalia, Carnivora, Felidae, Felis