In 1859 Charles Darwin published his historical book "On the Origin of Species." In the book, he proposes the principle of natural selection. He states that the bodies and organs of living beings gradually adapt to improve what they are used for, while in some parts that fall, they become smaller before disappearing. Look at other plants and organisms; the human body is the result of millions of years of natural selection. The body parts we need to survive become special when we do what we do not need. But what parts have we lost over time? This is what we want to answer.
Understand the facts about human development.
Number 10: Eyebrows
Many species of early humans had eyebrows, including Homo erectus, Homo heidelbergensis, and our cousin, the Neanderthal maker. The area of the head just above the eyes leans back to the top of the head, like the heads of chimpanzees and gorillas. By the way, Homo sapiens have lost their eyebrows. Instead, we have flat faces and high foreheads that go up until it merges with the top of our head. Why is this? Researchers are not sure why ancient people had eyebrows or why we lost them. However, they feel that we have lost them for social reasons. During a social experiment, anthropologist Grover Krantz noticed that people avoided him and even crossed the streets not to pass him when he was wearing a Homo erectus-like mask in public. This indicates that the fronts were not so flattering and that they should sag. People became more socialized and lived in larger communities. In turn, our heads have become smaller, and we have developed more prominent and agile eyebrows that we use to convey subtle information and feelings.
Number 9 : Claws
Logic says that vegetarian organisms have hooves, carnivores have claws, and omnivores have claws or fingernails. In fact, all omnivores would have had claws if they were not primates, a group besides related creatures that includes humans, monkeys, lemurs, lorises, monkeys, and tarsiers. The first primates had hooks that they used to dig and scrape, but they lost them when they started living in the trees. The claws are very useful for climbing trees. However, it quickly becomes uncomfortable when a primate wants to move from one branch to another. This was the reason why the first primates developed hands and nails that could climb trees and hold branches.
Figure 8: Forearm legs
We have all seen an image of a monkey hanging or hanging from the branches of a tree and possibly using its legs. They are prehistoric bones and are a defining characteristic of apes and primates. Consider them as bones that can serve as extra arms if needed. Humans are the only primates without forelegs. We've had it before, but not yet. In the early days, people were already walking their feet on the ground. His fingers gained strength and power, and he lost his flexibility as he developed to walk and run. Our first four fingers had already lost their flexibility, and the big toe moved quickly, making it the last part of our body.
Number 7: Slaughtering
Gold front teeth, exhaust
Look at the teeth of chimpanzees, gorillas, oranges, and other great apes, and you can not miss the long, sharp dog teeth. People also have dog teeth, but these are just names. It is not long nor sharp and hardly longer than other teeth in our mouth. So we do not have long, sharp dogs like other monkeys? In fact, we were earlier, but they lost them after getting lost. Like other monkeys, early humans developed large dogs to fight other males for dominance. The assessment of these fights was a special right to treatment for many or all of the women in the group. Be that as it may, the struggle for domination gradually became obscure as the first human babies became vulnerable and vulnerable to predators. As a result, human men spend more time protecting their children than fighting for mating rights. Our channels are getting smaller than before and are currently the smallest they ever were.
Figure 6: Lang's arms
In the beginning, humans had poor arms and legs, like the apes of today, when they first appeared six million years ago. Conversely, we have short arms and long legs. Why did this happen? The reason for this is not far-fetched. The first humans were few and survived on a vegetable diet. This meant that they needed a large digestive system and organs to process their food. This has resulted in their rib cages expanding to meet their increased digestive needs. 1.9 million years ago, when humans migrated to warm climates and added meat to their diets. His body became narrower, and his digestive system became smaller because smaller organs and digestive systems were needed to digest meat. In addition, the legs can move long distances when hunting and chasing prey. The feet of the first humans continued to grow until the first Homo erectus appeared. He was the first ancestor of modern people who emigrated from Africa. His legs were spectacularly long, so he could lose body heat.
Number - of 5: Big belly
The human brain has grown so far since Homo habilis first appeared two million years ago. The Homo habilis brain was about 600 cubic centimeters. 1.5 million years ago, however, Homo habilis became extinct and was succeeded by Homo erectus, whose brain size was about 900 cubic centimeters. The inventors know that our brains have gotten bigger as we have access to more food. Ironically, our stomachs got smaller at the same time. On the face of it, it really does not make sense for big brains to need more energy, which in turn requires more food. Our stomachs must logically be larger to consume more food. The opposite happened because early humans made the switch from a strict vegetarian diet, which went from low-quality plants to a non-vegetarian diet that includes high-quality meat. Their stomachs have become smaller because meat contains more nutrients and energy than plants.
Four numbers: Big eyes
Some types of early humans had large eyes. These include Neanderthals, our cousins, who freely intervened in Homo sapiens for nearly 5,000 years before becoming extinct. Explorers believe that the Neanderthal developed large eyes after migrating from Africa to colder parts of Europe and Asia, where there was little sunlight. His eyes widen to make room for more light. On the other hand, our little Homo sapiens eyes are because we were made in Africa, where there was enough sunlight. There are, of course, suggestions that the Neanderthal's large eyes were a double-edged sword that may have contributed to their extinction. The researchers believe that he devoted much of his brain to processing information with his eyes. This meant that other parts of their brains, including those needed to develop complex social skills, such as Homo sapiens, were smaller.
Number 3: The tail
Modern humans develop tails in embryos and have small tail bones after they are born. The tail and tailbone are actually remnants of the long tails we had in the past. However, we missed those ropes twice. We expanded, lost, and regained it before losing it a second time. Humans first lost their tails when Atheretmon, an extinct fish considered the ancestor of all living things, lost one of its two tails. Tails, one on top of the other. The first was a normal tail fin used to swim, while the second a fleshy tail used to swim fast. However, the fish later lost most of its fleshy tail and retained its regular tail again. Many years later, Aetheretmon would completely lose its regular tail feathers as it evolved from a marine animal to a semi-aquatic and later land. Living being. In the fleshy tail, however, this previously lost tail is seen today like most animals. Hominids that would later become apes and humans lost this fleshy tail when they started walking on two legs. Apparently, Tails would have influenced her upright posture. Today, humans, chimpanzees, and gorillas do not have tails. Many monkeys have long tails, but those that move a little upstream have shorter tails.
Number 2: Skin
Why do humans have hair, even if monkeys have hair? To find out the reason for this, we need to go back to Australopithecus after genesis, a hominin that was previously considered the ancestor of humans. Australopithecus afarensis looked more like monkeys than humans. Consider it a monkey with human characteristics. It had arms, legs, and fur, but it had a large brain and could walk upright like humans. When the Australian apheresis of Osteopithecus left the cover of dense forests to hunt meat in the open savannah, it brought in more sunlight than they were used to. The skin prevents sweating and traps heat, which can cause excessive heat in the body and brain by Australopithecus arenas. Then they started losing their fur to make them sweat and lose heat more easily.
Number 1: Mustache
Most mammals have mustaches, but not humans. We do not have those things. It is interesting that we had mustaches before, but we lost them about 800,000 years ago. To understand why we lost mustaches, we need to understand why some animals still have them. Some people use their mustache to complement their eyes. Every creature with a mustache actually has two types of a mustache: a long mustache and a short mustache. Animals use long whiskers to find their way in the dark and surrounding spaces, while short whiskeys are reserved to identify objects. By the time we both transferred the work of the mustache to our other parts, our people had lost the mustache. Lips and genitals. These parts are sensitive, like a mustache, because they take information from our environment and deliver it to our brain.