Questions about the classification of biology, what is taxonomy studied?

Protozoa are phylum Protozoa, not kingdoms, and you may be confused with the prokaryotic kingdom.

Vertebrates are a subphylum, and the subphylum cephalic chordates and caudal chordates both belong to the phylum Chordates.

Taxonomy is artificial, difficult to achieve, and different scholars have different views.

Boundaries, phyla, classes, orders, families, genera, and species are all based on the characteristics of organisms themselves, and those with the same characteristics are grouped into a large category, and then subdivided according to subtle differences. If there are a large number of them, or they are obviously different from other categories, and they are very far related, they can be independent and become a phylum or class.

In fact, these classifications of biology are not all artificially prescribed.

There are various classification methods now, but now this 5 realms system is more widely used and more recognized.

As for why vertebrates are inferior to single-celled organisms, so to speak:

The two general boundaries are: the prokaryotic general boundary and the eukaryotic general boundary

The six kingdoms include: Virology, Schizon, Cyanobacteria, Fungi, Plants, and Animals.

Protozoa do not belong to the kingdom).

Classification systems are hierarchical systems that typically include seven main levels: species, genera, family, order, class, phylum, and bounda. The species (species) is the basic unit, the closely related species are grouped into genera, the closely related genera are grouped into families, the family is subordinate to the order, the order is subordinate to the class, the class is subordinate to the phylum, and the phylum is subordinate to the boundary.

With the progress of research, the taxonomic level continues to increase, and secondary units can be attached to the upper and lower units, such as general order (superclass), subclass, subclass, general order (superorder), suborder, suborder, general family (superfamily), subfamily, etc. In addition, new units can be added, such as stocks, groups, families, groups, etc., the most permanent of which are families, between subfamilies and genera.

Classification is based on the common characteristics of different organisms.

Ha ha! And don't forget the very important message – vertebrates are also made up of single cells.

All living things in the world are composed of single cells, so single cells are the foundation of living things. Without cells, there is no living thing. In this way, the "position" of protozoa is indeed much larger than that of vertebrates!!

Supplement: cell—to—tissue—to—organ—to—system—to—body

This was done by a bunch of people hundreds of years ago, and you can ask them to go.

1. The English name of the kingdom, the English name of the phylum, the English name of the division, the English name of the class, the English name of the order, the English name of the family, the English name of genus, and the species English name.

2. Taxonomy is a branch of biology that studies the methods and principles of taxonomy. Taxonomy is to follow the principles and methods of taxonomy to name and rank various groups of organisms.

The Swedish biologist Linnaeus named the organisms, and then the biologists classified them by domain, kingdom, phylum, class, order, family, genus, and species.

The most popular classification is a five-kingdom system, which is the prokaryotic kingdom, the protist kingdom, the fungal kingdom, the plant kingdom, and the animal kingdom. It does not include viruses in their noncellular form, perhaps because the status of the viral system is unknown. Its protist kingdom is vast and complex, including all protozoa and other eukaryotic algae except red algae, brown algae, and green algae, including different animals and plants.

Taxonomy, commonly known as taxonomy, is a basic science that studies the similarities and differences between biological groups and the degree of similarities and differences, and elucidates the genetic relationship, genetic inheritance, and the evolution process and development law of organisms. In order to classify living things, we must first know the definition of living things and non-living things, but we don't seem to have a way to define them accurately, in the case of viruses, although they can parasitize and replicate in other organisms, they do not have the characteristics of ordinary organisms outside the body, such as making or ingesting nutrients, reproduction, etc.

For example, prions that cause mad cow disease can cause infection but have no DNA components, and DNA has always been regarded as the genetic material of life, through the transcription and translation process with RNA, to form proteins, and then further form various parts of the cell, such as cell membranes, organelles, etc., and the cell is the smallest unit that we have long thought of as the composition of life.

This classification should reflect the evolutionary tree relationships between different organisms. Taxonomy divides organisms into different groups, while systematics tries to find relationships between organisms. The dominant taxonomy is the Linnaean classification system, which includes a genus name and species epithet.

I know that the fields involved are relatively wide, for example, there are animal kingdoms, plant kingdoms, and then prokaryotic kingdoms, as well as fungi kingdoms, which are also very authoritative disciplines, and they are used in many places in life.

Taxonomy involves many fields, such as plants, animals, fungi, prokaryotes, protists, and viruses.

Taxonomic societies are involved in the field of biology, the field of species, the field of prokaryotes, the field of plants, the field of cells, the field of eukaryotes.

【Answer】a

Answer analysis] test question analysis: In order to find out the kinship between organisms, biologists divide them into different levels according to the similarity of the morphological structure characteristics and physiological functions of organisms, first divide the organisms into three categories: the plant kingdom and the animal kingdom and other organisms, and the following is divided into 6 levels, from high to low: phylum, class, order, family, genus, and species

A: This question examines the taxonomy and taxonomic units of organisms