The current taxonomic system now has eight levels in its hierarchy, from lowest to highest, they are: species, genus, family, order, class, phylum, kingdom, domain. Thus species are grouped within genera, genera are grouped within families, families are grouped within orders, and so on (Figure 1).

Carolus Linnaeus

Carl Linnaeus was the famous 18th century Swedish botanist and naturalist who created the basic biological taxonomy — the so-called binomial classification system — that is the foundation of our modern taxonomic system.

The Taxonomic Hierarchy

• Domain. A domain is the highest (most general) rank of organisms.
• Kingdom. Before domains were introduced, kingdom was the highest taxonomic rank.
• Phylum.
• Class.
• Order.
• Family.
• Genus.
• Species.

There are seven main taxonomic ranks: kingdom, phylum or division, class, order, family, genus, species.

Eight kingdoms model

• The first two kingdoms of life: Plantae and Animalia.
• The third kingdom: Protista.
• The fourth kingdom: Fungi.
• The fifth kingdom: Bacteria (Monera)
• The sixth kingdom: Archaebacteria.
• The seventh kingdom: Chromista.
• The eighth kingdom: Archezoa.
• Kingdom Protozoa sensu Cavalier-Smith.

Humans belong to the animal kingdom, which includes small organisms — like insects — and larger organisms, like humans and monkeys.

Answer. Humans, chimpanzees, gorillas, orangutans and their extinct ancestors form a family of organisms known as the Hominidae. Researchers generally agree that among the living animals in this group, humans are most closely related to chimpanzees, judging from comparisons of anatomy and genetics.

Humans belong to the domain Eukarya. The three domains are Eukarya, Archaea, and Bacteria.

noun. The domain comprised of eukaryotes or organisms whose cells contain a true nucleus. Supplement. Eukarya (or Eukaryota) is one in the three-domain system of biological classification introduced by Carl Woese in 1990.

The human body is a combination of both prokaryotes and eukaryotes. The human body contains a large number of prokaryotes. In the real sense of it, the number of prokaryotes in the human body exceeds the number of human cells present in the body.

“Humans belong to the domain eukarya. This is because humans posses a nuclear membrane and also posses membrane bound organelle.”

Mammal

Despite the fact that we have gobs of prokaryotic cells living inside and on us, humans are still categorically eukaryotic organisms. This means that all human cells—including those found in the brain, the heart, the muscles, and so on—are also eukaryotic.

There are several differences between the two, but the biggest distinction between them is that eukaryotic cells have a distinct nucleus containing the cell’s genetic material, while prokaryotic cells don’t have a nucleus and have free-floating genetic material instead.

The eukaryotes developed at least 2.7 billion years ago, following some 1 to 1.5 billion years of prokaryotic evolution.