How exactly did living things evolve? It seems that current scientists on this question are also confused and just use the theory of evolution to explain all this. Our planet is home to a wide variety of creatures, from the simplest single-celled organisms to complex mammals. The scientific community now generally believes that species on the earth are constantly adapting to the environment through genetic mutations, and organisms continue to differentiate in a long process, which means that all living things on the earth seem to be traced back to the same ancestor.
<h1 class="pgc-h-arrow-right" data-track="3" > humans evolved from apes</h1>
We would say that humans evolved from ancient apes, after all, from the perspective of blood, the animal closest to humans is chimpanzees, and the genetic difference is only 1.6%. So where did the first primates come from?
We can find the answer in the evolutionary tree, it is generally believed that mammals evolved from reptiles, and reptiles evolved from amphibians, and amphibians were originally marine aquatic animals, according to this logic, it is not difficult to imagine that humans evolved from marine life step by step to the current appearance.
Man, as a high-class animal, is also arrogant, and many people are reluctant to admit that they are actually a "monkey" at first. This is why evolution was first considered heresy and rebellious when it first appeared in the public eye.
<h1 class="pgc-h-arrow-right" data-track="7" > life originated in the ocean</h1>
There is enough evidence on Earth to prove the evolution of fish into amphibians, amphibians into reptiles, and finally into advanced mammals. A series of fossil evidence can show that the life on earth gradually evolved by relying on this evolutionary tree, so how did the fish climb up the land step by step and finally evolve into humans?
How are humans classified in the animal kingdom? Animal kingdom - Chordate phylum - Vertebrate subphylum - Mammals - Primates - Human family - Human genus. From this classification, it is clear that humans are vertebrates, with a spine that runs through the body, and generally speaking, the body of the vertebrate is symmetrically distributed, and the spine makes the body more stable and strong, more flexible.
The earliest vertebrates on the earth come from fish in the ocean, for example, the Haikou fish found in Yunnan, China, is the earliest vertebrate that has been found in the world, and this fossil specimen can be traced back to the early Cambrian period of 520 million years.
According to current scientific research, the first life on Earth began to be born and evolved in the ocean, and the early complex life probably began during the Cambrian explosion of life, and the Haikou fish in Yunnan were also creatures of that period.
Time went on, and in the Devonian Period, 290 million years ago, fish entered a period of full development, and some fish began to enter the fresh water from the ocean.
<h1 class="pgc-h-arrow-right" data-track="13" > fish heading overland</h1>
Later, with the advancement of the orogeny movement, some waters began to dry up and were no longer suitable for the survival of fish, so there were the first fish from the ocean to the land. Some fish inevitably die because they cannot adapt to life on the ground, while some fish try to walk with their own fins, and over time exercise, their limbs appear and they form a body structure that can obtain oxygen in the air.
In the beginning, these animals could only live sometimes on land, sometimes in water, and most of the life activities still had to be carried out in water. But as they evolved, they eventually became amphibians, breathing with their lungs on land, their gills in the water, and breeding in the water.
Amphibians are a transitional phase in the evolution of marine life into reptiles. Scientists have found an ancient fish that lived about 370 million years ago and has fish-standard physical features on its body, but its fins hide bones and joints that have never been seen before. This proves that they are capable of crawling on land, and they are also considered evidence of the transition from fish to vertebrates.
The survival of amphibians was still largely limited by water bodies, and after the emergence of amniotics and a huge change in breeding patterns, animals began to reproduce and hatch on land. Amniotic membranes prevent the water inside the eggs from evaporating, thus ensuring that the eggs do not die of dryness. The characteristics of fish began to fade, and animals began to transform into reptiles.
<h1 class="pgc-h-arrow-right" data-track="18" > amphibians evolved into reptiles</h1>
Reptiles evolved the way of vivogene reproduction, allowing fertilized eggs to survive and develop in the body, evolving early mammals. Therefore, the process of evolution from apes to humans is all too familiar. Usually we think of Australopithecus more than 3 million years ago as a transitional species between apes and humans, such as lucy, an ancient ape found in East Africa, which has the characteristics of ape brains and human upright walking.
Humans evolved from fish, which are not just a fish, but finned fish, which are now largely extinct. Scientists believe that their unique body structure allowed them to evolve skeletons and bodies suitable for walking on land. It is because of this step from the ocean to the land that the finfish have made humans appear on the earth. And if there is any mistake in this process, the earth will not be what it is now.
Evolution itself is a seemingly regular but chaotic thing, and every mutation and every accident has created the current human beings and the current earthly creatures. Do you think there is something in your body that still retains the characteristics of fish?
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