How did fish turn into humans during evolution?

When you think of human evolution, you more than likely imagine chimpanzees living in the wild in ancient times or giant animals carved on the walls of caves by early humans. But along with bears, lizards, hummingbirds and dinosaurs, we humans are actually fish in a way. It may sound a bit strange, but the evidence is in our genes, anatomy and fossils. We belong to a group of animals that live on land, the Sarcopterygia.

But due to the extreme change in the course of evolution, we have this present form. Sarcopterygia or lobe-fin fishes are fishes whose fins are attached to their torso by only one main bone. We think of fish as adept at swimming, but in reality they have developed this ability by walking at least five times. Some species have further developed themselves in this direction by using well-developed feathers.

Our Sarcopterygia ancestors developed lungs and other respiratory systems, bony limbs, and a strong spinal cord before arriving on land. This adaptation proved useful not only in the aquatic environment, but it also helped our ancestors to find places to live, where they adapted to life. The move from water to land was an important event in the evolution of vertebrates.

It may have started as a way to fend off invaders, but the places our ancestors found to live were already rich in plants such as mosses, horsetails and ferns. We’re not alone: ​​There are currently more than 30,000 species of fish, only a few of which can walk. Sarcopterygia differ from other types of fish in several ways. For example, our feet are supported by bones that have muscles on them and that help us walk on land.

This adaptation may have played a role in the migration of amphibians (in water and on land), mammals, reptiles and birds to our land at the end of the Devonian period (about 375 million years ago). The walking Sarcopterygia fishes either became extinct or evolved too much to be recognized as fish in later times. An example of this is the mudskipper fish.

It is found in the marshy areas of the mangrove forest and uses its wings to walk on the ground. Another example is the walking catfish, which uses its fins to walk on land. A big question is, which gene might have played a role in the development of the muscles that enabled us to walk? To find out, a team of researchers from Seoul and New York looked at which gene was active in the nerve that controls leg muscles in mice, chickens and skates.

They found a similar gene pattern in the motor nerve that helps these muscles work. Our ancestors used to run for hunting, to escape from the attacking animals. It shaped our anatomy. Many studies have shown that walking and running are important for our fitness and physical health.

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