Species
species
Scientific name... Genus= Alces, Species= Alces.
Kingdom, Phylum, Class, Order, Family, Genus, and Species
Several reasons; firstly many of the classifications do not represent actual relationships. Due to the breakthroughs in genetics, many of the older classifications are being discovered to be completely wrong. Also, species are not static and unchanging, they change over time.
The likely word is the singular or plural noun species(classifications of living things).
There is NO opposite for species (a taxonomic classification).However, the opposite taxonomy of species and subspecies (the narrowest classifications) would be a kingdom (the most general classification).
There are around 30-35 taxonomic orders in the animal kingdom, and this number is constantly evolving as scientific understanding of species relationships and classifications improves.
three
Phylum: Chordata Class: Mammalia Order: Perissodactyla Family: Equidae Species: Equus caballus
The term "vertebrates" refers to animals with a backbone, including groups such as mammals, birds, reptiles, amphibians, and fish. As of current estimates, there are approximately 66,000 recognized species of vertebrates. This number can vary as new species are discovered and classifications are updated.
There are approximately 900,000 arthropod species within the animal kingdom (insects and spiders), 100,000 species of roundworms and mollusks, and fewer than 50,000 species of vertebrates (20,000 fish, 8,700 birds, 6,000 reptiles, 2,500 amphibians, and 4,500 mammals). In total, that makes approximately 1,050,000 species within the animal kingdom.