Are human beings an alien species on earth? In fact, this is true in many aspects. Among millions of species on the earth, only humans have developed intelligent civilization. We have left footprints in every corner of the earth, which is something that many species cannot do. The deepest Mariana Trench is more than 11,000 meters. Even if the highest peak on earth is placed in it, it will still be several kilometers short of being exposed to the water, but even places like this have already had human footprints. With the development of science and technology, the earth can no longer stop our desire for exploration, and human beings have begun to fly out of the earth towards the stars and the sea.
After the end of World War II in the last century, the United States and the Soviet Union launched a space race, which greatly promoted the development of mankind in the space field. Gagarin was the first human to fly out of the earth, and Armstrong was the first human to land on the moon. We are indeed unique among the millions of species on earth, but from some perspectives this is a normal result.
The African savannah is a paradise for animals. Different types of animals live there. Predators include lions, spotted hyenas, leopards, etc. Herbivorous animals are more abundant. During the annual East African animal migration, you can see the mighty army of animals passing through the savannah. Abundant species means greater competition. For example, giraffes on the African grasslands normally have no natural enemies. Even lions, the king of African animals, will not easily hunt giraffes.
Of course, even if a giraffe is attacked, it is usually an old, weak, sick or disabled individual. This is mainly because the giraffe is heavy and has strong limbs. If a giraffe accidentally kicks it, it will be difficult for a lion to resist. However, giraffe calves have much weaker defenses, so they will stand up quickly after birth and can run and jump.
But humans can't. Not to mention tens of minutes or hours, a newborn baby needs a long time to develop. If it is in the wild without the help of its parents, it is almost impossible to survive.
Many people think that humans have degenerated in the process of development, but is this really the case?
First of all, after hundreds of thousands of years and millions of years of development on the earth, everything is gradually getting better. We have developed from the poor little trembling people on the African savanna to today to the top of the food chain. It is because we invented tools and learned to use them, which gave us an advantageous position. However, in ancient times, human ancestors were not very high in the food chain, and there were even natural enemies. For example, the extinct ancient overlord of cats, Direcats, was a type of saber-toothed cat. 3 to 5 million years ago, scientists believed that they ate Australopithecus apes as food and became the natural enemies of Australopithecus apes.
However, in the process of development, they became extinct and completely withdrew from the stage of history.
As a typical social animal, humans like to live in groups so that they can better survive in dangerous wild places. Nowadays, human beings have technological capabilities to create various tools. With these tools, we can survive better, and the birth pressure of babies is not as great as that of other species, or even no pressure at all. Like the gazelle baby below, he may face such a situation soon after birth and be chased by a lion. Therefore, he needs to stand up and learn to run as soon as possible. This is the way to survive.
Human beings are all "premature infants", which is related to the development and evolution of human beings.
There are millions of species on the earth, each of which has its own way of survival. Some species run fast, some species are large, and some species are good at hiding. Humans rely on smart brains, which also results in humans having a brain shell. At the same time, humans gradually begin to walk upright during the development process, all of which make production difficult.
A large skull makes it difficult to give birth, and walking upright narrows the birth canal. Therefore, it is said that the mortality rate of dystocia has increased over a period of time. Therefore, in the process of evolution, the baby does not fully develop and mature in the mother's womb, and needs careful care and upbringing after birth.Therefore, in a sense, human beings are all "premature babies".
Let’s take another example. The giraffes mentioned above can stand up, run and jump within half an hour after they are born. This has something to do with their gestation period. Giraffes will stay in their mother’s belly for about 15 months, and the development time before birth is relatively long. And like some marsupials, their newborn babies are as small as a peanut. Not to mention standing up, running and jumping, they cannot be exposed for too long and can only live in the pouch of the kangaroo mother for a long time.
Their gestation period may be about 30-40 days, so it belongs to the kind of completely underdeveloped situation.
said that in the end
any species needs to face tremendous pressure to survive on the earth, especially the reproduction of offspring. If the pressure to survive is very high, they must be allowed to develop as fully as possible in the mother's belly, so that the newborn cubs will have stronger adaptability. This is also a point of great concern for mammals. After all, unlike reptiles that lay eggs in and , they pay more for small embryos. Even if the mortality rate is high, many individuals will eventually grow up.
