Did Humans Evolve From Fish

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Did Humans Evolve From Fish – The Human Edge: Finding Our Inner Fish One very important human ancestor was an ancient fish. Although it lived 375 million years ago, this fish called Tiktaalic had shoulders, elbows, legs, wrists, neck and many other basic parts that have become part of us. This is the first story in our summer series, The Human Edge, in which we explore how evolution created the most versatile animal on the planet.

An illustration of what Tiktaalik sea creatures might have looked like. Tiktaalik, known as the “Fish Leg”, bridged the gap between sea and land animals and played an important evolutionary role in our journey to becoming human. Zina Deretsky/National Science Foundation hide caption

Did Humans Evolve From Fish

Did Humans Evolve From Fish

It took years of research in the Canadian Arctic, but in 2004, Neil Shubin found the fossilized remains of what he believes to be one of our most important ancestors.

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Shubin says finding what he named Tiktaalik represents an important evolutionary step because it contains structures that will eventually become part of our human body. Shoulders, elbows, shins, necks, wrists — they are all in Tiktaalik.

“We have a big brain, and some of that big brain is invisible in Tiktaalik,” says Shubin. “But the pattern, down to the DNA that makes it up, is already there in such animals.”

“It’s like peeling an onion,” he said. “Layer after layer is revealed to you. Like in the human body, the first layer is our primate history, the second layer is our mammalian history, and on and on and on until you get to the basic molecular and cellular machinery that makes our bodies and keeps cells alive etc.”

In fact, not only are we related to ancient fish, but many of the parts essential to making yeast are also important to our creation, says Gavin Sherlock, a geneticist at Stanford University.

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“About a third of yeast genes have a direct equivalent version that is still present in humans,” he said.

Sherlock says that not only do many of the same genes exist in humans and yeast, but they are so similar that you can swap one for the other.

“There are hundreds of examples where you can hit a yeast gene, put in a human equivalent, and restore it to normal,” he said.

Did Humans Evolve From Fish

Think about it, he said: We have a lot in common with yeast. Yeast consumes sugar like us, yeast produces hormones like us, and yeast creates sex—not quite like us, but sex.

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Sex is not all fun and games. Sexual reproduction is critical to stirring the genetic pot, accelerating the evolution of infinitely more beautiful forms, from fruit flies to blue whales to humans.

Now, yeast is a single-celled organism. There are billions and billions of cells in our body – different types of cells, all together. How did this happen?

Shubin pointed to a showcase of an exhibition on evolution. “This little diorama here that you would just walk past is arguably one of the most important to understanding our body,” he said. “What you see in this primordial ocean are plastic sheets and jellyfish-like creatures, but this is where single-celled creatures like bacteria and other microbes came together to make their first body.”

As time goes on, more forms appear. Again, Shubin points to an exhibition that is easy to miss. Inside is an ancient worm: it has left and right, front and back, top and bottom. These are the same coordinate axes as our bodies.

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“In fact, we believe that if you look at the evolutionary history of these things, many of the genetic processes that make bodies like this, and our own bodies, arose more than 500 million years ago,” Shubin says.

The fossil named “Lucy” was an australopithecus and evolved from a common human ancestor. Hide caption courtesy of the Field Museum

As we walk through the exhibition with Shubin, we see the results of tinkering with these genetic processes. Evolution brought fish, dinosaurs, mammals. Finally we come to a familiar looking 4 foot tall creature.

Did Humans Evolve From Fish

This is Lucy, the Australopithecus. It is more similar than modern man, but it got there. Despite being around humans, Lucy is clearly not human. Australopithecus became extinct.

Human Evolution Illustration

Shubin pointed to the cabinet on the other side of the room. Inside is a re-creation of a prehistoric human burial site. There is the skeleton of a woman placed in a grave, surrounded by her jewelry.

“It’s hard to look at it as a fossil anymore,” says Shubin. “You look at it as a person who lived and who loved that person enough to do that. And it changed.”

Shubin says it’s not bone, muscle or genes that make us human. It was something else.

“Physiology and genetics made it possible. It’s the model that made it all happen,” he said. “But when is that spark, when is that moment? We don’t know.”

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That moment gave us an evolutionary advantage that led to who we are today—a species that buries its dead, builds museums, explores outer space. Shubin says the culture we build with our bones, muscles and brains is what makes our species unique. fish

The research, led by Chinese Academy of Sciences (CAS) academician Zhu Min, was published in four papers in the top journal Nature on Wednesday.

Zhu’s team from CAS’s Institute of Vertebrate Paleontology and Paleoanthropology discovered well-preserved bone fossils from the early Silurian period in Chongqing Municipality and Guizhou Province in southwest China over the past decade.

Did Humans Evolve From Fish

The fossils include five new species of ancient fish, and among them are the oldest known vertebrates with toothed jaws, which the researchers say is important.

Brain Evolution From Fishes To Human. Heads Of Fish, Amphibian, Reptile, Bird, Dog And Homo Sapiens. Vector Illustration. Royalty Free Svg, Cliparts, Vectors, And Stock Illustration. Image 66797019

“Without jaws, life would be unimaginable… The origin of jaws may be the most important and profound evolutionary event in the history of vertebrate evolution,” CAS explained in an article posted on its WeChat account.

According to Zhu, human body structures such as the eyes, nose, mouth and jaw are traceable to fish.

“The new data allow us … to gain much-needed information about the evolutionary steps leading to the origin of important vertebrate adaptations such as jaws, sensory systems and paired appendages (limbs),” he said.

3D restoration image of five early fish species found in Chinese fossils. /Monkey science

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Jawed vertebrates, also known as gnathostomes, are believed to have originated around 450 million years ago, as their appearance and growth is thought to represent a major “fish-to-man” innovation.

Many of the vital organs and structures of the human body come from the early evolutionary history of jawed vertebrates, which make up more than 99.8 percent of modern vertebrates, including humans.

Previously, the earliest identified jawed fish fossils were only about 425 million years ago, making it difficult to reconstruct the early evolutionary history of jawed vertebrates from about 450 million years ago.

Did Humans Evolve From Fish

The research team led by Zhu used new technologies and methodologies, including high-precision CT scans and big data analysis, to present to the world for the first time the oldest teeth, head and body of previously unknown jawed vertebrates. These findings help fill in some of the gaps in the evolution of humans from fish. It MIGHT sound a little fishy, ​​but some of humanity’s earliest ancestors were more like trout than chimpanzees.

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That’s because we’re all descended from fish that swam in Earth’s ancient oceans hundreds of millions of years ago.

Although many millennia have passed since then, the human body still contains biological echoes of our watery past.

From hiccups to shallow “dents” on the top of our lips, these remnants were discussed by scientist Dr. Michael Mosley in a BBC News article.

Hiccups are annoying at best and downright infuriating at worst, but they’ve been a part of human biology for as long as we’ve existed.

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He thought that involuntary gulps were a holdover from our fish ancestors who needed them (or something similar) to breathe.

These spasms cause a sudden drop in air and force your vocal cords to close for a very short time, producing the characteristic sound.

Scientists think hiccups are the result of how we breathed after we split from our fish ancestors.

Did Humans Evolve From Fish

This humble hiccup is thought to have been passed down to us by our fish ancestors Credit: Getty Images – Geti

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The nerves that activate breathing make a short and easy journey from the brainstem to the throat and limbs.

In humans, the brainstem must send signals to the throat, chest, and diaphragm—a more complicated journey.

Our respiratory system may differ from that of a fish, but our departure from the simplicity of our ancestors caused our diaphragms to spasm.

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