Why did the snail s visceral mass continue to twist during evolution?

Snails are invertebrates, molluscs, gastropods, lung snails, snails. The shell is generally low-conical, right- or left-handed. The head is conspicuous, with 2 pairs of antennae, and the apex of the large 1 pair has eyes. The ventral surface of the head has a mouth with a toothed tongue that can be used to scrape food.

Snails have carapaces, are shaped like small snails, and are diverse in color; The head has four antennae, the head is extended when walking, and the head and tail are retracted into the carapace together when frightened; Snails have saliva on their bodies, which can restrain centipedes and scorpions. In June and July, when it is hot, it hangs under the leaves and rises high until it dies after salivaing.

Snails are the animals with the most teeth, but their teeth are not "three-dimensional teeth". Despite having tens of thousands of teeth, they are unable to chew food. This is because they crush food with a toothed tongue – a ribbon-like structure covered with teeth – so that it can be digested.

Over the course of a lifetime, their tiny teeth slowly wear out and dull and are replaced by new, sharper teeth. Snail excretion is excreted close to the breathing hole, which is called a stomata. It excretes its feces on its body, and eventually leaves it on the ground through its gastropods and mucus.

The mantle cavity of the snail will create 1 opening at the mouth of the shell, called the "breathing hole", which is where the gas enters and exits. If you look closely, the breathing holes will often open and close, like the "nose" used by a snail to breathe; When the snail is retracted into the shell, it still leaves the opening of the breathing hole at the mouth of the shell to breathe. The mantle is often between the feet or visceral masses, forming a cavity that communicates with the outside world, which is called the "mantle cavity".

The respiratory organs of the snail are hidden in the mantle cavity, and sometimes through the snail's shell, you can vaguely see the dense network of pulmonary blood vessels under the shell, most of which are located on the anterior side, near the direction of the head, which is the location of the mantle cavity.

Because this is the characteristic of the snail's visceral mass, it is constantly twisted into asymmetry.

When the snail is retracted into the shell, it still leaves the opening of the breathing hole at the mouth of the shell to breathe. The mantle is often located between the feet or visceral masses, forming a cavity that communicates with the outside world.

This is to adapt to life inside the shell.

Constantly distorting into asymmetry. so that you can breathe.

This is so that the snail can be retracted into the shell.

In order to allow the snail to retract into the shell in case of danger.

It is not a snail that molts. The internal organs of the snail are contained in the visceral sac, and from the mouth to the inside, there are parts such as the esophagus, stomach, intestines, and liver.

In order to facilitate the changes brought about by a better living environment.

Snails are invertebrates, molluscs, gastropods, and pneumospira.

I'll tell you when I'm a snail in my next life.

Yes, by nature. Snails belong to mollusks, and mollusk shells are formed on much the same principle, both are formed by the condensation of secretions.

The outer and middle layers of the shell are secreted by the edge of the mantle, which gradually increases with the growth of the snail, but does not thicken; The inner layer is secreted by the entire mantle and can increase in thickness as the individual grows. The growth of the cuticle and chitinium of the snail shell is not continuous, and the growth rate of the snail shell is different in different periods due to the influence of food, temperature and other factors, so the growth line is formed on the surface of the shell, indicating the speed of birth growth.

The formation of snail shells dates back to the gestation period of snails. The snail shell belongs to the covering, which is an important organ possessed by mollusks. Calcium carbonate is the main component of snail shells (although small amounts of protein are also mixed together).

Therefore, to build these shells, the covering creates an electric current that helps the organism to propel calcium ions into the right place. Before hatching, a baby snail grows a kind of original shell, which is the first part of its shell. Once our little snails are away from the eggs, a healthy diet becomes a priority.

The covering will require additional calcium to strengthen and enlarge the crust. Instinct forces the newborn snail to eat the calcium-rich eggs that have just escaped. Thus began a lifelong habit.

The mantle cavity of the snail will create 1 opening at the mouth of the shell, called the "breathing hole", which is where the gas enters and exits. If you look closely, the breathing holes will often open and close, like the "nose" used by a snail to breathe; When the snail is retracted into the shell, it will still leave the opening of the breathing hole at the mouth of the shell to breathe.

The mantle is often between the feet or visceral masses, forming a cavity that communicates with the outside world, which is called the "mantle cavity".

The respiratory organs of the snail are hidden in the mantle cavity, and sometimes through the snail's shell, you can faintly see the dense network of pulmonary blood vessels under the shell, mostly on the anterior side, near the direction of the head, which is the location of the mantle cavity. The main thing is to protect yourself.

Shells are innate. The snail is a mollusk, and the shell of the mollusk is formed by the coagulation of secretions.

The shell of a snail is natural because the shell of a snail can be used not only to protect itself but also for breathing.

Yes, snails are born with small shells on their bodies, in order to defend against changes in the outside world. I really didn't envy them, I just had a house when I was born.

Yes, the shell that the snail has from birth, is both its own house and a place to protect itself.

Born to protect yourself and breathe at the same time.

Definitely yes, it's like a tortoise shell, it's protective, it's easy to live in.

Of course, the Kerra I have are innate, otherwise how can I protect myself and thrive.

Yes, I've seen a bunch of small snails in the body of a big snail, and those are all small shells.

Yes, people are born with houses, and the babies in the future will also have houses, which is called wealth.

That's right, don't you have little snails too, they're all born.

The special features of snails are antennae and gastropods. The head of a snail has two pairs of antennae, one of which has a large antennae with eyes on the tip. mouth on the ventral surface of the head; The feet are large and the ventral surface is flat, which is suitable for crawling.

The visceral sac is hidden inside the shell and contains the internal organs of the snail. The two pairs of antennae of the snail are very special, when the head and feet are stretched out and crawling on the ground, the two pairs of antennae are always stretched out and move slowly.

The snail is also a hermaphroditic animal, but it cannot reproduce on its own, and it must have two snails to reproduce offspring.

The snail lays about 200 eggs at a time, and it is the most hated small animal for farmers.

When did our way of life come back, I was really, I was indeed a very fond of the relationship between people, what kind of life was the relationship between people, I was indeed a very fond of it...

Snails are the animals with the most teeth in the world. Although its mouth is about the size of a needle, it has about 26,000 teeth. A little lower in the middle of the snail's small antennae is its mouth, which has a jagged tongue that scientists call a "toothed tongue."

The snail's eyes are the longer antennae, and its nose is the shorter tentacles. The snail's mouth is in the middle of its eyes and nose, the snail's feet are under its body, and the small grains are its feet.

The snail's mouth is about the size of a needlepoint, but it has 25,600 teeth that are invisible to the naked eye, and the teeth are worn out and can erupt teeth. The snail's big antennae are eyes, and its small antennae are its nose!

The snail's mouth is about the size of a needle tip, but it has 25,600 teeth, which cannot be seen with the naked eye, and the snail has 2 antennae, an eye, and the eye is at the tip of the longest antennae!

The secretion of poisonous snails is poisonous, don't catch poisonous snails, don't be afraid of 10,000, just in case!!

Snails can go 4 years without eating or drinking without dying.

The silver filament on the back of the snail is the crab object of the snail.

The secret of a snail is that inside a thick shell, you never know what's hidden.

Am I going to carry his home to **? He is not afraid of hard work.

That's mucus secreted by snails.

Because the snail moves in waves, moving forward, if the soles of its feet are dry, they cannot exercise, so the gastropods secrete a very rich mucus that helps it crawl, and this mucus dries quickly and shines as soon as it encounters air. So much so that wherever the snail crawls, it leaves a shiny trail.

It's a snail's secretion, and I think it's anti-slip, keeps the body moist, slows down the sun's burning, and so on.

This is because the snail has a glue-like protective film on its body. It is good for crawling, not stained with other substances, and even more conducive to crawling!

It's the same as human secretions, and it's good for going home!

''The snail is afraid that it will not find its way back、、、''Agree!

His secretions are normal.

Snail? I don't know, I've seen it on TV

Secretions left after they have dried.

The snail is afraid that it will not find its way back、、、

"It's an instinct of living beings, innate, and it's something that is gradually formed in the long process of evolution in order to adapt to survival. Generally speaking, snails forage for a very wide range of food, staple food a variety of vegetables, weeds and melon peels; The leaves, stems, buds, flowers, and juicy fruits of crops, and these foods, especially the leaves of fresh plants, are generally found at the upper end of the plant, and the ancient snails that tended to climb down were eliminated by nature because they did not have enough food."

Why snails only climb up is an instinct of living beings, congenital, and gradually formed by organisms in order to adapt to survival in the long-term evolution.

Generally speaking, snails forage for a very wide range of food, staple food a variety of vegetables, weeds and melon peels; Crop leaves, stems, buds, flowers, juicy fruits, and these foods, especially fresh plant leaves, are generally found at the upper end of the plant, the ancient snails that tend to climb down are eliminated by nature because they can't get enough food, so only the snails (757007170) that tend to climb up can get enough food to survive, this selective gene gradually remains in the body, forming the current snail always tends to climb up.

There are only young leaves on the top, so climb up.

The snail didn't know why he was climbing up.