The reason why crabs walk sideways

Question 1: Why does the crab walk sideways?

First, the geomagnetic field says that crabs rely on the geomagnetic field to judge their direction. In the long years after the formation of the earth, the geomagnetic north and south poles reversed many times.

Turn around. Many creatures are at a loss and even become extinct because of the reverse transfer of the earth's magnetic poles. Crab is an ancient migratory animal, and its inner ear has orientation.

Small magnet, very sensitive to geomagnetism. Due to the reversal of the geomagnetic field, the small magnet in the crab lost its original direction. In order to make yourself

Crabs that survived the reversal of geomagnetic field.

"

Change with constancy-change with constancy.

"

When practicing, simply don't move forward or backward, but walk sideways.

Second, from a biological point of view, the head and chest of crabs are indistinguishable in appearance, so they are called head and chest. The feet of this animal grow on both sides of the body.

Side. The first pair of pliers are not only tools for digging holes, but also weapons for defense and attack. The other four pairs are used for walking, called walking feet. Each foot

They are all composed of seven sections, and the joints can only move up and down. The chest width of most crabs is greater than the length, and they can only bend their feet to one side when crawling.

Grab the ground with your toes and stick your other foot out. When the toes reach the distant ground, they begin to contract, while the originally bent feet immediately extend.

Straighten up and push your body to the other side. Because these pairs of feet are different in length, the crab actually walks forward. however

Not all crabs can only run wild. For example, long-armed monks and crabs who live in groups on the beach can run forward. Living in seaweed

Many spider crabs can also climb vertically on seaweed.

The answer to why crabs are flooding seems to provide us with an inspiration to solve some problems in life. If you live in the world, you will meet.

Many changes are independent of human will, and the best way to adapt to these changes is to adjust yourself. Otherwise, I only like those who are not suitable.

Creatures with reversed magnetic poles, resulting in

The tragedy of "extinction" In fact, when dealing with the troubles of life, you are not going forward or backward, but walking sideways, maybe not.

Make a difference. Some people may ridicule the ugly posture of crabs, but no one can deny that crabs will walk faster sideways.

Thirdly, through experiments, it is found that the bone eye (where the muscle bundle passes) connected with the limbs in the crab has two upper and lower bone eyes (that is, two bundles of muscles) in each limb.

Connected to it. Moreover, the bending direction of the joint at the root of the limb is the dorsal direction, so when the muscle contracts, the limb moves in the dorsal direction, so

Crabs walk sideways.

Question 2: Why do crabs walk sideways? Aren't you walking upright? Crabs can walk vertically, but because the function of moving joints forward is almost degraded, they adopt lateral movements. There is a kind of "magnetic particle" similar to a compass in the crab, which plays a guiding role in the crab's action direction. So the crab walks sideways and lets the inefficient brain think about the direction, because in this way, the crab can change the direction of its body by moving its limbs forward or backward.

Crabs in the deep sea, such as giant spider crabs and heroic high-legged crabs, have 360-degree movements of their limbs, which can not only walk vertically and horizontally, but also walk obliquely.

Due to the change of geomagnetic field

Many animals rely on the geomagnetic field to judge their own direction, especially for migrating animals, which plays a very important role. Crab is an ancient migratory animal. Its inner ear has a small directional magnet, which is very sensitive to geomagnetism. Due to the reversal of the geomagnetic field, the small magnet in the crab lost its original direction. In order to survive the reversal of the geomagnetic field, the crab adopts the practice of "changing with the constant", simply walking sideways without advancing or retreating. From a biological point of view, the crab's chest is wider from left to right than before and after, its eight feet extend to both sides of its body, and its forefoot joints can only bend downward. These structural features also allow crabs to walk sideways.

The answer to why crabs are flooding seems to provide us with an inspiration to solve some problems in life. When a person lives in the world, he will encounter many changes that are independent of human will, and the best way to adapt to these changes is to adjust himself. Otherwise, it can only cause the tragedy of "extinction" like those creatures who are not adapted to the reversal of magnetic poles. In fact, in dealing with the troubles of life, we are not going forward or backward, but walking sideways, and maybe there will be a different world. Some people may ridicule the ugly posture of crabs, but no one can deny that crabs will walk faster sideways.

Question 3: Why do crabs walk sideways? Money (pliers) is willful. Others say they are in a hurry to date. Anyway: it's going to cross the road and go across the street. I told you to cross the street, so I walked sideways.

Question 4: Brain teaser: Why does the crab walk sideways? Because of pliers (money), willfulness.

Question 5: Why do crabs walk sideways? The eight legs used by crabs to walk are straight and bent, so they can't move back and forth, and they can only walk sideways.

Question 6: Why do crabs walk sideways? Animal world? Why do crabs walk sideways?

Every animal has its own set of strategies to escape from the enemy.

Ugly crabs, when in trouble, quickly break their claws or feet (that is, cut themselves) to get rid of them, and after a while, they can regenerate new feet.

So how do crabs grow new feet? After the crab's foot was broken, a soft nodule grew on the residual surface about 6 days later.

It is wrapped in a transparent chitin bag, which is called limb bud.

In the next two or three weeks, limb buds grew rapidly and began to segment.

Its epithelial tissue, striated muscle fibers, motor and sensory neurons also appeared.

After that, it entered a slow growth stage that lasted for several months.

Finally, near molting, limb buds begin to grow rapidly again, with obvious segments. The joints between segments grow completely, and there are sensory hairs and thorns on the surface. Sensory nerves are embedded in sensory hairs, and tissue growth is completed here.

After molting, the limb bud removes the chitin sac and forms a new foot.

The above situation gives us an inspiration: if the crab's foot is cut off from the autologous slice, will it regenerate like this? Some people have done experiments to cut off the joints between the crab's feet and body and observe its regeneration.

It was found that the crabs after this operation always regenerate a complete basal node first, and then grow limb buds.

This shows that the existence of basal ganglia is an important condition for foot regeneration.

Later, it was found that there were abundant protein near the self-cutting surface of crab feet, which was to prepare for the regeneration of feet.

From the phenomenon of crab's broken foot regeneration, it can be seen that the regeneration structure and function of crab are self-contained, and it forms a complete unity with self-cutting, which enhances the ability of animals to adapt to the environment, and the geisha population can survive and continue under the long and cruel natural selection.

Why do crabs spit?

Boy, you must like crab meat very much.

But have you ever seen a live crab? If you have seen it, you will find many white bubbles on its mouth.

What's going on here? It turns out that crabs live in water and breathe with their gills like fish, but the gills of crabs are different from those of fish.

Crab gills, which grow on both sides of the upper body and are covered with hard head shells.

When crabs breathe in water, they inhale oxygen from their feet and then spit it out from both sides of their mouths.

Crab gills can hold a lot of water.

When it crawls on land, it can still breathe as if it were in water.

When it sucks in too much air, the water in its gills will spit out along its mouth with the air, forming countless bubbles and accumulating on its mouth. This is the phenomenon that we see crabs spitting.

This time, you see, the crab spit is the waste gas discharged by breathing on land, not what we thought that crabs spit quickly.

Why do crabs walk sideways?

When some children rampage and don't look ahead, some people will joke, "You are a crab, how can you walk sideways?" .

"Because we often hear this sentence, we all know that crabs walk sideways.

So, why don't crabs walk forward like other animals, but crawl sideways? It turns out that the four pairs of feet used by crabs to walk are very special.

Each of its feet consists of seven joints, each of which is connected by a film, and each joint will not rotate.

When walking, you can only pull muscles and bones up and down by the membrane between the two sections, and the movement range is not large, so you are greedy when walking.

It first grasps the ground with four toes on one side of its body, and the four feet on the other side extend outward to support the body and push the body to crawl horizontally.

Therefore, crabs can only adapt to walking sideways, but can't adapt to the front and back direction, and the walking speed is relatively slow.

Why is the crab's "leg" so prominent that it can't find its head? Huahua and her brother buy crabs from the market together.

When he got home, he looked left and right, but he couldn't find its head.

So I asked my brother, "Why can't I find the crab's head?" Brother said: "The crab's legs are really developed and have their own uses, but its head is too underdeveloped. It grows with a very developed chest, forming a head and chest.

Crabs have eyes, antennae, small jaws and large jaws on their heads.

From the appearance, there is no obvious boundary between head and chest, so many people think that crabs have no head.

However, because the back of the head and chest are covered with hard breastplates, it is more difficult to distinguish the boundary between head and chest.

"Hua Hua said," ah! I see! "

Source: Zhang Xiaogang ... >>

Question 7: Do you know the story of why crabs always walk sideways? Because there are too many legs, the little head can't command, so he walks sideways.

Question 8: Brain teaser: Why do crabs walk sideways? ? Crabs rely on the geomagnetic field to judge their own direction. In the long years after the formation of the earth, the geomagnetic north and south poles reversed many times. Many creatures are at a loss and even become extinct because of the reverse transfer of the earth's magnetic poles.

Crab is an ancient migratory animal. Its inner ear has a small directional magnet, which is very sensitive to geomagnetism. Due to the reversal of the geomagnetic field, the small magnet in the crab lost its original direction. In order to survive the reversal of the geomagnetic field, the crab adopts the practice of "changing with the constant", simply walking sideways without advancing or retreating. From a biological point of view, the crab's chest is wider from left to right than from front to back, and its eight feet extend on both sides. Its forefoot joint can only bend downward, and these structural features also make the crab walk sideways. The answer to why crabs are flooding seems to provide us with an inspiration to solve some problems in life. When a person lives in the world, he will encounter many changes that are independent of human will, and the best way to adapt to these changes is to adjust himself. Otherwise, it can only cause the tragedy of "extinction" like those creatures who are not adapted to the reversal of magnetic poles.

In fact, in dealing with the troubles of life, we are not going forward or backward, but walking sideways, and maybe there will be a different world. Some people may ridicule the ugly posture of crabs, but no one can deny that crabs will walk faster sideways.

Question 9: "Do you know why crabs walk sideways?" "Why A: Do you know why crabs walk sideways? I don't know. . . A: I am willful because I have pliers! ! B: Yes. . . ... do you know why crabs walk sideways? I don't know. . . A: I am willful because I have pliers! ! ...

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Question 10: Why does the crab walk sideways? Because of money, I am willful. Where did it come from? This is a brain teaser based on what happened not long ago. Use homophones.

Not long ago, a person was cheated by hundreds of thousands. He found out when he was cheated by tens of thousands at first, but he didn't call the police because he wanted to see how the other party cheated him. . . It was ridiculed by the majority of netizens as: money is so capricious!

So, rich, willful and angry. So this joke also comes from this!