Topic content:
The following statement about biological taxonomic units is correct ()
A. Species are the most basic taxon, and the same species have the closest relationship
B. Organisms of the same family have more common characteristics than those of the same family
C. The number of organisms in the same class unit is less than that in the same family unit
D. The biological classification units from small to large are kingdom, phylum, class, order, family, genus and species
Best answer:
From large to small, the biological classification unit is the world, phyla, class, order, family, genus, and species. The world is the largest classification unit, and the most basic classification unit is species. The larger the classification unit is, the less the similarity of organisms is, the less common characteristics are, the more biological species are included, and the farther the biological kinship is; The smaller the classification unit is, the more similar the organisms are, the more common the characteristics are, and the fewer biological species are included, so the closer the biological kinship is. For example, human race: yellow race, white race, black race, they have more similarities, and the closer the kinship is
Therefore, A
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