There are five major species of vertebrates, their respective representatives and characteristics

Classification of animals.

Analysis: Vertebrates include fish, amphibians, reptiles, birds, and mammals, <> answers: 1. Fish is the largest group of vertebrates, and there are about 24,000 species of fish in the world, which exceeds the sum of the number of vertebrate species of other classes, so a is correct;

2. There are about 24,000 species of mammals, which are not as many as fish, so B is wrong;

3. There are more than 9,000 species of birds in the world, which are not as many as fish, so C is wrong;

4. There are more than 1 million species of insects, but insects belong to invertebrates, so D is wrong What fish is the most diverse among vertebrates.

Comments: Key points: Fish are the most diverse and most abundant group of vertebrates.

There are actually six groups of vertebrates. The round-mouthed group is the most primitive class of extant vertebrates, without upper and lower jaws, also known as jawless. It lives in the ocean or freshwater, has no paired appendages, and lives parasitic or semi-parasitic, with large fish and turtles as hosts.

Fish, tailed without limbs, tail bifurcated, breathing with gills, living in water, oviparous, body temperature is not constant.

Amphibians, with tails and no limbs, larvae breathe with gills and live in water. They live as adults on land or in water, have no tail and limbs, and breathe mainly with their lungs, and when in the water, they can breathe with **. Oviparous animals, the body temperature is not constant.

Reptiles, generally crawling close to the ground, have lungs in their bodies, and their body surface is covered with scales and nails. ** scales or nails on the surface, breathing with lungs, living on land, and having an unconstant body temperature.

Birds, with beaks and no teeth, feathers on the surface of their bodies, breathe with their lungs, and are mostly able to fly. Mammals, full body coat, constant body temperature, viviparous, lactating, breathing with lungs.

Birds, mammals, amphibians, reptiles.

Vertebrates, also known as cephalic animals, are derived from animals with skulls and vertebrae, such as fish, amphibians, reptiles, birds, mammals, and humans.

Vertebrates appeared 500 million years ago in the early Cambrian period as part of the "Cambrian explosion". Fish fossils such as Kunming, Haikou and Zhongjian in the Chengjiang fauna of Yunnan Province were excavated in early Cambrian strata. Fossil specimens show that the head of the Haikou fish has eyes, the earliest brain protected by cartilaginous tissue, a notochord, and some putative vertebrae.

The earliest vertebrates of this class were jawless and collectively known as jawless, and could only feed by filtering food suspended in seawater or by sucking, which was simple and stiff.

The most primitive vertebrates looked inconspicuous and even had to be attached to a sponge to fix their bodies, but it was the first to grow a notochord that ran through the whole body, from which later vertebrates were derived.

The earliest vertebrate in the definition of Bai is a type of Kunming.

There are two kinds of sea Zhikou fish, and only these three species were discovered at the beginning, and they evolved later.

Out of the genus the definition of vertebrates is the odontomorphs, after which the so-called ' appeared. Fish', fish is just a general term for a class of aquatic vertebrates with a similar body structure, divided into jawless and jawed general, the last head turtle of the jawless general class is a modern vertebrate in the true and complete sense, which also differentiates into today's round mouth class, and the jawed general class is divided into shield fish, cartilaginous fish and bony fish according to the appearance time, the appearance of jawed fish marks the official beginning of the brutal rule of vertebrates for the entire earth for more than 400 million years, whether it is predation, filter feeding or vegetarian food are at the crushing peak of various carbon cycles in addition to corrosiveness, according to the chronological order of the amphibians, reptiles, mammals, birds, and now the mammals have become not only the kings of vertebrates, but also the kings of the whole world, and it is difficult to have new kings.

What are the classifications of vertebrates.

5 Original: Vertebrates are characterized by a vertebral vertebrae in their bodies, which are divided into fish, amphibians, reptiles, birds, and mammals from low to high.

It is divided into six major groups: roundmouths, fish, amphibians, reptiles, birds, and mammals.

Vertebrates Vertebrates (vertebrata): animals with vertebral bones, a subphylum of chordates. This type of specialized animal is generally in the right and left pairs.

The genus is called the whole body divided into three parts: head, trunk and tail, and the trunk is divided into chest and abdomen by the diaphragm, and there are relatively complete sensory organs, motor organs and a highly differentiated nervous system. It includes five major categories: fish, amphibians, reptiles, birds, and mammals.

Vertebral bai: an animal with vertebrae, a subphylum of chordates. It has the largest number, the most complex DAO structure, and the highest status of internal capacity, which evolved from mollusks.

The morphological structure is very different from each other, and the lifestyles are very different. Vertebrates are generally symmetrical in shape, and the whole body is divided into three parts: head, trunk, and tail, with relatively complete sensory organs, motor organs, and a highly differentiated nervous system. It includes six categories: roundmouths, fish, amphibians, reptiles, birds and mammals.

Hope it helps.

What are the classifications of vertebrates.

Fish, amphibians, reptiles, birds, and mammals.

Fish, amphibians, reptiles, birds, mammals.

Crabs are actually counted as amphibians......

Although vertebrates make up only a small part of the animal kingdom, they are all familiar to humans. The most striking feature of vertebrates is the presence of vertebral or bony vertebral columns, and the complex internal skeleton makes vertebrates adaptable, whether they live on land or in water. Scientists divide vertebrates into five categories:

Fish, amphibians, reptiles, birds, and mammals.