The biggest pain in this world is that women have children. The pain caused during the delivery process is level 10, and both caesarean section and are dangerous. Many people can't help but ask: "Developmental, difficult delivery... The method of viviparous birth is so unreliable and has no advantage. Why do humans evolve from egg birth to fetal ?"
What is the difference between egg birth and viviparous
Before understanding this problem, let's first understand what the differences between egg birth and viviparous. During the biological evolution of , two ways of reproduction are produced, egg generation and viviparous generation. The so-called egg generation refers to the independent development of the fertilized eggs of animals outside the mother's body. Some egg animals need to be hatched because the structure of the eggs itself carries nutrients and can be hatched only if they need a suitable temperature environment. In addition, some egg animals are accompanied by the behavior of raising children.
, and viviparous means that the larvae is directly conceived in the maternal body and is produced after development and maturity. The biggest difference between egg birth and viviparous birth is when females seal the embryo. If the female seals the tire too early, it will become an egg and reproduce in the form of an egg. If the female chooses a sealed tire very late, it will become a fetus and will be delivered through childbirth. In nature, birds, reptiles, and most fish are oviparous animals.
The biggest advantage of egg growth is that it can produce a large number of eggs at one time. looks like some fish, which can throw out hundreds of thousands of eggs at once. However, the egg-generating method also has its disadvantages. First, the quality of egg-generating and development offspring is not high, and second, egg-generating animals will always worry that their new eggs will be stolen by egg thieves. In vivo animals, their production method is called "snatching pups", but as humans with high IQ, the production method is called "birth".
Advantages and Disadvantages of Egg Raw
An cow will suddenly stop as you walk on the grassland. Do you think they are eating grass with their heads down? Wrong, they are under calves . It is easy for viviparous animals to have cubs. They can have cubs in the morning and continue to be busy with their own affairs in the afternoon. However, human production is not easy and requires confinement. In short, the biggest difference between egg-generating method and viviparous method is the buyout system and the stop system. cannot say who is the best and the worst, it can only be said that each has its pros and cons.
Human evolution Why do you still choose to be born with a fetal birth instead of egg birth?
Among viviparous animals, humans are the most special. Because humans are viviparous animals that walk upright, has a long-term walking upright and has a large head, it will cause the human pelvis to be narrow. Especially for women, the pelvis is wide at the top and narrow at the bottom, and the birth canal is small and rugged. Although such a body is relatively fragile and does not have any advantage in the mode of production, humans have not become fragile because of this. Instead, they have become the overlord and the strongest animal on the earth.
So, in the unique history of human evolutionary civilization, why did it evolve from egg birth to viviparous birth? If it is egg-generated, can women suffer less when they reproduce?
When life was first created, humans evolved from egg birth to viviparous birth, which is a long and complex process. The original way of reproduction was asexual reproduction , which is an ancient reproduction method without fertilization. This reproduction method does not require germ cells, only somatic cells. cell division unintentional willow insertion, resulting in sexual reproduction , to later unisexual reproduction .
Asexual reproduction
After the mass extinction of Devonian , many vertebrates who once lived in the sea gradually began to land on the shore because their body structure is very primitive and they have lived in the water for a long time, so even if they go ashore, they cannot leave the water source all the time. Especially when reproduction, you need to go to the water.
to Carboniferous , amphibian gradually flourished , completely breaking away from its dependence on the water environment, evolved the earliest amniotic , and the genus Monoarch is one of them. amniotic eggs are when the embryo develops to a certain extent, and the amniotic membrane will form around the embryo. In the cavity wrapped in the amniotic membrane, there is rich amniotic fluid , which provides a stable living environment for the embryo. The emergence of amniotic eggs can be said to have created congenital conditions for the reproduction and offspring of vertebrates.
When the dinosaur era was completely over, life on Earth was reborn, and egg animals and mammals appeared. Mammals began to dominate the entire Cenozoic generation through viviparous growth. For mammals, the survival rate of viviparous breeding offspring is very high. 's pregnancy cycle is very long, but it is very dangerous to have more than one child during pregnancy. So since this is the case, why do mammals, mainly humans, still choose to be born in the evolutionary history?
phylogenetic tree of amniotic animals
The reason is very simple. can ensure that when reproduction, it has time to find food and kill two birds with one stone, rather than simply wasting time on incubation issues. Secondly, this evolution method is from the pressure of natural selection , which evolved this special embryo-bearing uterus. The emergence of placenta ensures the efficient reproduction of mammals, which is impossible for all egg animals to achieve.
is precisely because of this more complex physiological structure that mammals are endless on earth. In traditional ideology and consciousness, the way for the ancestors who created life was to reproduce was egg birth, and then oviviparous and viviparous dysfunction. In the evolutionary history, humans have become viviparous mammals, which are also determined by natural selection. After all, compared with the egg-generating method, the survival rate and quality of viviparous birth are very high.
Viral Evolution of Vertebrate Animals
Can humans realize egg generation in the future?
In the future high-tech development, can humans become oviparous animals? Break a pile of eggs and hatch it with a machine. When needed, adopt a few children and take on the role of parents by yourself, eliminating the pain of fertilization. Complex high-tech such as
seems to be very far away, but it is not impossible. However, such intelligent machine egg-generating methods violate our human instinctive cognition, and simply violate human moral ethics. Although the emerging technology of increases the efficiency of reproduction, the children born from eggs also have no feelings for their parents.
So in the process of life evolution, natural selection of genes is the basis of evolution. Artificial intelligence creates a new life and breaks away from the constraints of fetal hardware form, which is the end of human original life. Because the warmest and most reliable thing in creating human life is uterus , which is a fact that can never be changed and cannot be replaced by any artificial intelligence.
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