People have legs and stomachs, why don t animals generally have them?

It may be because the physiological structure of humans and other animals is different, and the human leg and stomach are to ensure the normal circulation of blood.

The pumping function of the calf is that the calf muscles contract, the pressure sends blood to the heart, and the calf muscles relax, which can also prevent blood from flowing backwards. Such a series of functions ensure the normal circulation of blood. <>

The pumping function of the legs and stomach has the following effects in addition to blood circulation. If the blood circulation is better, the amount of blood delivered to the whole body increases, and the cells of the whole body can be supplied with sufficient nutrients and oxygen. If there is a lesion, it not only promotes blood return, but also has the effect of self-**.

When the pumping function of the legs and stomach fails, the ability of blood to return to the heart becomes weaker. As a result, blood is trapped in the lower veins, causing the pressure inside the veins to increase and expand, causing blood to flow backwards. At this time, the water cells in the blood increase, and the symptoms of edema appear.

If such a state is left unattended, diseases such as vein aneurysm, hyperpigmentation, and ulcers may occur. <>

Do not remain in the same position for long periods of time. Holding the same position for a long time can worsen blood circulation. If you sit in front of the computer for a long time or stand for a long time due to work, it is not good for your body, so take advantage of the rest time to do simple exercises to consciously improve blood flow.

Watch out for obesity. Obesity is the leading cause of venous return disorders. When you find that your obesity index is exceeded, you have to find a way to improve it.

Perform calf exercises. It is important to consciously use the muscles of the calf. You can usually stand on your tiptoes and put it down repeatedly, which can effectively exercise the calf muscles.

Because the physiological structure of humans and animals is different, people will definitely be different from animals in appearance.

Because you're mentally retarded, who said four-limbed animals don't have little tendons? Dogs, cats, pigs, sheep, cows, deer, locks, etc., all have their forefeet on the ground, and the little leg you see is like a human foot.

Although humans are mammals, they are not structurally the same as others.

The function of the leg and stomach can increase basal metabolism, metabolism, increase body temperature, and make cells younger, and the function that the animal has is provided by other parts.

Because the structure of an animal's body is different from that of a human, animals generally do not have legs and stomachs.

This may be due to the fact that humans walk on two feet for a long time, so they slowly form legs.

Because the structure of animals cannot adapt to the natural environment, they exercise too much.

The part of the animal is usually muscle, and it does not have legs and stomachs.

Each has its own structural characteristics and may be a special environmental survival need.

Because the body structure of humans and animals is different, animals have a lot of bones.

earthworms, snakes, snails, snails, shellfish, mussels, whales, sharks, dolphins; Among reptiles, snakes and a few lizards and salamanders have no feet; Among the lower invertebrates, parasites (roundworms, tapeworms......Annelids (earthworms) and so on also do not have legs; Single-celled animals and protozoa are even more legless.

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.

The mystery is: snakes.

Snakes are a group of animals belonging to the phylum Chordates, the class Reptiles. The body is elongated, divided into three parts: head, trunk and tail, without limbs or claw-like hind limbs on both sides of the cloaca transversely lobed by lower snakes; Covered with scales; The head is of a variety of shapes, with nostrils located on the snout side, but the lifelong marine serpentidae species live on the back of the snout.

Protective transparency outside the eyeball**, pupils round, vertically oval or horizontal, no active eyelids, lenses almost spherical; tongue elongated and bifurcated; The premaxilla (only python snakes have teeth), maxilla, palatine, pterygoid and tooth bones are attached with teeth with back-curved tooth apex, but the size, number and structure of the teeth vary from snake species to species. The tail is significantly shorter than the head body length.

There are many animals without legs, such as snakes, snails, shellfish, earthworms, dolphins, whales, snails, fish, etc. There are also some mollusks, annelids, single-celled animals, and coelopods that have no legs. They are all animals that do not need to rely on their legs to move, and they can be found both in the water and on land.

The snails move backwards and slowly forward by the horizontal stripes under their belly, and they use their gastropods to crawl in wavy movements and leave mucus trails as they crawl.

The fish in the water are motivated by the swing of the fins and tails. They swim very fast in the water.

All kinds of animals live in different environments, in order to adapt to the living environment, they have evolved their own way of moving, no legs do not affect their movement, but will be more advantageous.

<>1. Animals without legs are fish and some mollusks: like earthworms, snakes, snails, snails, shellfish, mussels, whales, sharks, dolphins, reptiles, snakes, lizards, salamanders, and also have no 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, torso, and tail, and has no limbs, or claw-shaped remains on either side of the mouth of the lower snake family.

3. The sea conch is a terrestrial gastropod. In Chinese, the snail refers only to a species on land, and in a broad sense, it includes the giant shield nose insect.

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.