How do human tails disappear? Do people have tails

Both humans and apes do not have tails, but their ancestors, monkeys, do. The tail goes from being there to nothing, which is a degenerative phenomenon. How to explain the phenomenon of degradation was a source of great distress for Darwin.

He proposed two mechanisms: one is due to non-use or "retirement", and the other is due to natural selection.

Let's look at these two mechanisms proposed by Darwin from the perspective of modern evolution. "Use-in, waste-out" should be taken apart and viewed: "use-in", that is, the belief that an animal's frequent use of a certain organ can lead to the becoming more and more developed of this organ in future generations, which is to use acquired inheritance to explain the evolution of adaptation to the environment, which is in conflict with modern evolutionary theory.

But "abolition" does not necessarily contradict modern evolutionary theory. In the view of modern evolutionary theory, "decommissioning" is actually the result of the accumulation of harmful mutations after natural selection has not worked. In the case of the disappearance of the tail, for example, the genes related to the tail will always mutate in the long run, and the vast majority of mutations are harmful.

But when the tail is functional, natural selection will eliminate harmful mutations and prevent them from accumulating. But once the tail loses its function, whether it develops or degenerates has no effect on the survival and reproduction of the individual, natural selection is no longer in charge, harmful mutations are retained and accumulated, and the tail becomes smaller and shorter until it disappears.

What if the disappearance of the tail is due to natural selection? That's because not having a tail has a survival advantage over a tail. However, it is meaningless to say this, and if everything is explained by the term "survival advantage", natural selection really becomes synonymous.

The key is to find out what kind of "advantages" there are. The tail is also made up of flesh and bones, and it can also hurt and bleed. When the tail has a function, an injury, bleeding have to endure.

But once the tail becomes a dispensable liability, it will be injured and bleeding will become a survival disadvantage. What's more, the cells that make up the tail need to be metabolized and need to be nutritious**; Walking with a tail also consumes extra energy. Wouldn't it be better if we could save the nutrients and energy that are given to useless tails and distribute them to more important organs, such as the brain?

Therefore, in this case, natural selection favors the tailless ones and the tailless ones are eliminated.

It can be seen that the degeneration of a certain part of the body, including the disappearance of the tail, is indeed possible to be used to "replenish the brain". Here, it is natural selection that works. Natural selection is not only capable of creating new organs, but also transforming and destroying old ones.

Man is purified by animals, and the tail is gone, and like a tadpole, the tail is gone.

It is the cause of human degradation, this is a scientific statement.

After sitting for a long time, it grinds in. Ha ha.

The reason why I don't use it often.

1.Snatched 2 for the monkeyI was so hungry that I burned it and ate it.

Man originally had a tail, but then it degenerated, and there is still a tailbone on the body of man today.

However, there is also a small chance that a child will have a tail, which is a returnee phenomenon, but it is generally cut off at birth, which does not affect life.

The squirrel's large tail is used for balancing, the bird's tail can change direction, the monkey's tail is the third leg that supports the body, and the horse's tail is a fly swatter in the summer, which is important for animals. Human Nianran evolved from animals', it seems that we should also have tails, but we don't, what about the tail **?

In the process of human evolution from animals, the role of the tail gradually disappeared. With the development of human evolution, the human brain is becoming more and more developed, and the movements are becoming more and more flexible, and the tail loses its original function, but is very obstructive, and slowly the tail degenerates. This phenomenon is inherited, so no one has a tail.

However, there are exceptions, and some people are born with tails or long hairs, which is what people call the "atavistic phenomenon".

When humans were embryonic, they did have tails, and in primitive times, humans also had a tail, but after a long evolution, that tail became a tailbone.

Yes, the fetus has a tail in the mother's body, but as it grows and gradually declines, there will be no tail when it is born, but some people have some problems when growing in the mother's body and the tail does not completely fade, leaving a tail tip or something

God gave man a board and an animal a rope.

Yes, degenerate, and the coccyx].

You can touch it yourself. ]

Yes, I didn't hear a saying called the root of the tail, take it.