What are the animals that don t have legs. What are the animals without legs A brief introduction to

Legless animals, most fish and some molluscs: such as earthworms, snakes, snails, snails, shellfish, mussels, whales, sharks, dolphins.

Among reptiles, snakes also have a few lizards.

Axolotls also have no feet; Lower invertebrates, parasites.

class (roundworms, tapeworms......Annelids (earthworms) and so on also do not have legs; Single-celled animals and protozoa are even more legless.

Further information: Snails are not a taxonomic name in biology, but generally refer to all terrestrial species of the class Gastropoda. In general, Western languages do not distinguish between aquatic snails and terrestrial snails, and in Chinese, snails only refer to terrestrial species, while snails in a broad sense also include giant shield slugs.

The snail is an animal that includes many different families and genera. Feeds on plants and lays eggs in the soil or on trees.

It is more common on tropical islands, but some also live in cold regions. Arboreal species are bright in color, while terrestrial species are usually several close colors, generally striped. The snail is the largest in Africa, measuring more than 20 cm.

Several species of the genus Snail in Europe are often used as delicacies, especially in France. Snails are the most common mollusks on land, and they have high edible and medicinal value.

Maggot. Earthworms, leeches, eye snakes, water snakes, fire sickle snakes, bamboo leaf greens, and, Lin Mengyun.

There are also three-legged ones, Xiao Ming. And, men.

1. Legless animals include fish and some mollusks: like earthworms.

Snakes, snails, snails, shellfish, mussels, whales, sharks, dolphins.

Reptiles, snakes, lizards.

Salamanders, also without legs.

2. Snake (scientific name: Snake family) is an animal belonging to the phylum Chordates and Reptiles. The body is slender, divided into a head, trunk, and tail, without limbs, or claw-shaped remains on either side of the colonization mouth of the lower snake family.

3. The sea conch is a terrestrial gastropod. In Chinese, snails only denote species on land, while in a broad sense, they include giant shieldnose worms.

4. Dolphins are a mammal that lives in the ocean, it is a small toothed cetacean, distributed in different oceans, they survive in groups, and they mainly eat fish and squid.

Legless animals have:

1.Snakes: Belong to reptiles and have no limbs.

2.Snails: belong to mollusks and have a bovine-shaped or spiral-shaped hard shell and no limbs.

3.Turtles: belong to reptiles and have a hard shell and no limbs.

4.Starfish: Echinoderms with five arms and no limbs.

5.Field snails: belong to mollusks and have a round hard shell and no limbs.

6.Jellyfish: Belonging to cnidarians, they have an umbrella-shaped body and no limbs.

7.Phylum Platyzoa: e.g. planarians, schistosomiasis, etc., without limbs.

Although these animals may seem to have no legs, they all have their own way of living and characteristics in nature.

Squid. , ten legs, not legs, can also be whiskers.

Squid, also known as cuttlefish, cuttlefish, squid marine cephalopod mollusc, and octopus and spear squid are closely related. The modern squid appeared 21 million years ago in the Miocene, and its ancestors were arrowstones. It is characterized by a thick calcareous inner shell (squid bone, cuttlefish bone or sea cricket, which can be used as medicine).

The body of the squid can be divided into three parts: head, feet and trunk, the trunk is equivalent to the visceral mass, and the outer body is covered with a muscular mantle with a calcareous inner shell.

The anterior end of the cephalic body is spherical, and its apex is the mouth, surrounded by oral membranes, and there are 5 pairs of wrists on the periphery. There are a pair of well-developed eyes on both sides of the head, and the structure is complex. There is an oval-shaped fossa at the lower back of the eye, called the olfactory trap, which is the olfactory organ, and the olfactory apparatus of gastropods is a chemoreceptor. <>

The foot has been specialized into a wrist and a funnel. 10 wrists, symmetrically arranged on the left and right, the first pair of the back is **, 2 5 pairs to the ventral side, of which the 4th pair of wrists is particularly long, the end is swollen and tongue-shaped, the front end of the body is spherical, its top is the mouth, there are 10 wrists, there are 8 short wrists, and there are two long tentacles for catching and eating.

It is surrounded by a mouth membrane, called a tentacle, which can prey and can be retracted into the tentacle sac. The inside of each wrist has 4 rows of suction cups with handles, and the tentacles only have 10 rows of small suction cups on the inside of the terminal tongue, which is called the tentacle spike. The middle sucker of the 5th wrist on the left side of the male is degenerated and specialized into a genital carpal or stemmed carpal carpal.

It can transport sperm pods into the female body and play the role of a mating organ.

In the animal kingdom, there are many animals that do not have arms, such as fish and invertebrates, which usually only have organs such as legs or tentacles to help them move and hunt.

Here are some animals that only have legs and no arms:

1.Frogs: Frogs have two legs and are used to jump and catch prey.

2.Spiders: Spiders have eight legs and are used for movement and prey.

3.Crabs: Crabs have eight legs and are used for movement and defense.

4.Millipedes: Millipedes have hundreds of legs that are used for moving and foraging.

5.Starfish: Starfish have five arms and use bridges to move and hunt.

In conclusion, there are a lot of animals that only have sensitive legs and no arms, and these animals rely on different organs to help them move and hunt.

Only legs come without arms, only the backbone has no braincase, love to sit cross-legged on the shelf, and hook the ears across the bridge of the nose The riddle should be glasses.

The general process starts from discovering the problem and raising the problem, and after discovering the problem, make assumptions about the answer to the problem according to their existing knowledge and life experience Design the first plan, including the selection of materials, design methods and steps, etc. After reaching a conclusion, it is also necessary to reflect on the whole process of the general methodological steps of the experiment: asking questions, making hypotheses, making plans, implementing plans, drawing conclusions, expressing and communicating

Commonly used methods in science include observation method, experimental method, investigation method and data analysis method Observation is a basic method of science Science can be directly observed with the naked eye, or with the help of magnifying glasses, microscopes and other instruments, or using cameras, video recorders, video cameras and other tools, and sometimes it is also necessary to measure Scientific observation should have a clear purpose; Observations should be comprehensive, meticulous, and realistic, and recorded in a timely manner; Be planned and patient; Think positively and record in a timely manner; To exchange views and discuss The design of the experimental protocol should be carried out closely around the questions and hypotheses raised When studying the influence of one condition on the research object, the experiment carried out under the same conditions except for the different conditions is called a controlled experiment General steps: find and ask questions; gather information related to the issue; make assumptions; design of experimental protocols; Conduct experiments and record them; analysis of experimental phenomena; Conclusion Investigation is one of the common methods of science When investigating, we must first clarify the purpose of the investigation and the object of the investigation, and formulate a reasonable investigation plan In the process of investigation, sometimes because the scope of the investigation is very large, it is necessary to select a part of the survey objects as samples During the investigation process, it is necessary to record truthfully The results of the investigation should be sorted out and analyzed, and sometimes the statistical method should be used mathematically Collecting and analyzing data is also one of the common methods of science There are many ways to collect information Go to the library to consult books and newspapers, and visit relevant peopleThe forms of information include text, data, and audio-visual materials, etc., and the information obtained should be sorted out and analyzed, and the answers should be found from the vertical and void.

Animals without legs are: mollusks, annelids, coelenterates, fish, single-celled animals, etc.

1. Molluscs.

Molluscs, also known as shellfish, are a general term for the animals of the phylum Mollusca, except for arthropods.

The largest taxon is about 100,000 species. The systems vary greatly, but there are common features The body is soft and not segmented, and it is generally divided into cephalic-foot (some heads are vestigial or absent; foot muscular) and visceral-mantle (composed of dorsal visceral mass, mantle, and mantle cavity).

2. Annelids.

The phylum Annelids has developed to a higher stage in animal evolution and is a higher invertebrate.

There were about 13,000 species. In vitro, there is a corneum secreted by epidermal cells, and the body wall has an outer ring muscle layer and an internal longitudinal muscle layer. Chitin is usually present.

of bristles, arranged in knots. There is a head or anterior lobe, and appendages are present or absent. Closed-tube circulatory system, blood usually has respiratory pigments.

The body cavity is divided into a compartment by a septum by a segment, and the split body cavity originates. It is distributed worldwide and is found in all kinds of ecological environments, especially in the ocean, freshwater or wet soils.

3. Coelenterates.

Cnidarian phylum.

Also known as the phylum Cnidozoa, it used to be called the phylum Coelenterates.

Because its meaning applies to cnidarians and ctenophores, most of them are now abandoned. The cnidarian body is radiated or symmetrical with only two germ layers, and is the most primitive metazoan.

4. Fish. Fish, the oldest vertebrate. Some offspring of crosses with different chromosome numbers are still fertile. They inhabit almost every aquatic environment on Earth, from freshwater lakes and rivers to saltwater seas and oceans.

5. Unicellular animals.

Single-celled animals are organisms composed of only one cell, and such animals tend to be relatively low-level, such as many bacteria are single-celled organisms.

Other organisms are much more advanced than single-celled organisms, and the various tissues and structures of the body are relatively well developed, and the adaptability to the external environment is strong, the survival of the fittest, and the elimination of the unsuitable, the current multicellular organisms are evolved from lower organisms like single cells, that is, any organism has cells, but there are exceptions, viruses do not have a cell structure, they are made of nucleic acids.

The outer shell of matter and protein is composed.