The evolution of man was from the bug fish what?

If you look at the evolutionary tree, you will understand that life lasted for 3.8 billion years, with early apes living about 3 million to 1.5 million years ago, and late Homo sapiens about 4-50,000 years ago.

Humans did evolve from fish, not just humans, but all terrestrial vertebrates were ancestors of fishAbout 300 million years ago, a group of flesh-finned fish landed on land, slowly adapted to the terrestrial environment, and evolved into amphibians, then reptiles, then mammals, and humans were born in this evolutionary process.

Modern biology believes that the evolution of living things is a process from simple to complex, not only the ancestors of humans are fish, but all living things on the earth today should be traced back to a common ancestor, and this original ancestor is called Luca.

It was the last common ancestor of all species before they diverged, and Luca was probably not the first life on Earth, but the first to reproduce and survive, and its offspring continued to evolve, eventually giving birth to the entire Earth's ecosystem.

Scientific research confirms that humans evolved from fish

Ancient fishes that lived hundreds of millions of years ago swam in the ancient ocean flexibly, which is the scene recovered by Chinese researchers based on a batch of fish fossil specimens found in the Chongqing peculiar buried fossil reservoir and the Guizhou Shiqian fossil reservoir.

Among the newly discovered fossil specimens, researchers have found the world's oldest jawed tooth fossils, and discovered a number of ancient fish fossils such as the oldest jawed miracle mountain fish, revealing the rise of jawed vertebrates.

Scientists have found that humans actually evolved from fish? Here's how the evolution went.

The fins of the round-fins have a unique bony structure that appears to be the precursor to the human thighs and arms. In particular, one of the round-finned species, the long-extinct palm-finned fish, has all the leg bones, except for the lack of feet and toes. As a result, scientists believe that this fish is the ancestor of all of us, our ancestors who had no limbs.

In the early 20th century, a theory was proposed to explain why the fish evolved legs and began to walk. That brutal Devonian sun must have been the cause of the great drought. The fish, who had lived freely, were suddenly trapped in a pool of water that was drying up and faced death.

In order to survive, some palm-finned fish had to flee from puddles and find deep water. So, just like the jumping fish now, the palm-fin fish dragged its fins and barely "walked" onto land. Some of these palm-finned fish begin to evolve on land, their fins become limbs, and they grow 5 fingers and 5 toes to start walking.

In this way, they become tetrapeds, becoming our ancestors. They grow limbs because they can do what we all do: walk on land.

The theory of "ponds drying up" seems to explain everything—why we have limbs, and what animals we evolved from. To prove this theory, it is only necessary to find the first quadruped on Earth, the animal that evolved as soon as the fish landed on land, the first fossil mentioned earlier. If, as scientists predicted, the animal had exactly 5 fingers and 5 toes, then it was done.

For this reason, many scientists have been trying to find this mysterious animal fossil for years, but have not been able to find it.

The only way to see the Devonian rock outcrops is to go to one of the few places in the world, one of which is Greenland. So in the 30s of the 20th century, a group of Swedish scientists visited the area several times, and their mission was to find the first animal with legs. In this group of experts, Eric Javik, who is the most unspoken and opinionated, and the least popular in the entire paleontological community, has found what people dream of – the first animal to grow legs and feet (not fins).

Javik called it the fish newt.

The search for this significant animal has been going on since 1859, after Darwin's time, and the fact that it has finally been found certainly makes the entire paleontological community rejoice. All Djarvik had to do now was to reconstruct the anatomy of the strange animal as much as possible. Of course, all this took a long time, and although Javik was a very good anatomist and had been working since 1948, it was not until 1996 that the basic analysis was completed.

During this time, he completed two articles, confirming the current theory. Javik says the fish newt is indeed a land-walking quadruped with five fingers and five toes. Thus, the mystery of why we have hands and feet is answered

When the palm-finned fish struggled to land with its fins in tow, it evolved into the first tetrapod, the ichthyosolotl. This is completely consistent with the scientists' **.

From an evolutionary point of view, the descendants of ichthyomorphs have so far dominated the planet, and while the animals at the top of the marine food chain are killer whales, the animals at the top of the land are Homo sapiens. And evolution has proven that they are all descendants of flesh-finned fish.

Flesh-finned fishes were mainly found in the Devonian period, and have been few since then, with a few remaining to this day. They were degraded in the evolution of fish, but for vertebrates, their evolution opened up a vast realm of infinite variation in the entire terrestrial vertebrate. From meat-finned fishes to amphibians, reptiles, to birds and mammals, including humans.

The ancestor of the fish is the Wenchang fish, which evolved from the Wenchang fish to the fish, and later evolved into amphibians.

According to the literature, fish were first found in the Ordovician strata dating from 400 million years ago, but the fossils of fish were incomplete at that time, and it was not until the late Silurian period that the concept of fossils and early vertebrate relationships was fully obtained. During the Devonian period, a variety of ancient and modern fish appeared.

The Devonian period can be described as both the first age of fish and the heyday of fish, at that time, because there were not many other vertebrates, so some people called the Devonian period "the age of fish". In the Cenozoic Era, the fish groups were very diverse, becoming the largest group of vertebrates, and it was the heyday of the development of fish.

The type of fish in shape

1. Spindle-shaped

Also known as the basic type, it is the body shape of a general fish, suitable for swimming in water, and the whole body is spindle-shaped and slightly flattened. Among the three body axes, the head and tail axis is the longest, the dorsal and ventral axis is the second, and the left and right axes are the shortest, so that the whole body is streamlined or slightly flattened, so as to reduce resistance when moving forward in the water, so this kind of fish is good at swimming. It often inhabits the middle and upper layers of water.

It can be used for long-distance migration. Examples: carp, crucian carp, shark.

2. Side-flat type

Among the three body axes of this type of fish, the left and right axes are the shortest, and the proportion of the head-tail axis and the dorsal and ventral axes is not too much, forming a symmetrical flat shape on the left and right sides, so that the whole body shape is flat and wide, therefore, the ability to swim is worse than the spindle type, and it lives in the middle and lower layers of the water. Long-distance migrations are rare. Such as pomfret, butterflyfish, bream, cochineal, swallowfish, etc.

Humans did not evolve from fish.

Human evolution originated from forest apes, and developed step by step from primates through a long evolutionary process. It has gone through four stages: ape man, primitive man, sapiens man, and modern man.

1. Early ape-man stage: It lived about 3 million to 1.5 million years ago, and already had the basic characteristics of human beings, able to walk upright, and make simple gravel tools.

2. Primitive humans: about 2 million to 300,000 years ago, the body is like a human, the brain is large, can make more advanced paleolithic tools, and began to use fire, such as the Beijing ape man in Zhoukoudian, Beijing, China.

3. Early Homo sapiens: 10-200,000 to 50,000 years ago, gradually detached from the characteristics of apes, and very close to modern humans, such as Neanderthals in Germany.

4. Modern man: About 4-50,000 years ago, the evolution of human beings at this time has accelerated significantly, and it has been very similar to modern humans in form. For example, in 1933, the cave man on the top of Zhoukoudian Keel Mountain was discovered.

At this time, primitive religions had already arisen and had entered a matriarchal society, and in the late Homo sapiens stage, modern humans began to differentiate and form, and distributed throughout the world.

Origin of Species:

1. "The Origin of Species" is a biological work by the British biologist Charles Darwin who systematically expounded the theoretical basis of biological evolution. The full name is "On the Basis of Natural Selection, That is, the Preservation of the Origin of Species of the Good Race in the Struggle for Survival".

2. In this book, based on a large number of research data accumulated in many fields such as paleontology, biogeography, morphology, embryology and taxonomy accumulated for more than 20 years, Darwin takes natural selection as the center to demonstrate the origin of species and the diversity and unity of life and nature from the aspects of variability, heredity, artificial selection, survival competition and adaptation. "The Origin of Species" not only ushered in a new era in the history of biological development, but also allowed the idea of evolution to penetrate into all fields of natural science.

Ectothermic vertebrates that live in water all their lives, breathe with gills, and use their fins to support balance and movement of the body. There are more than 2,000 species that have been discovered, and it is the most primitive and lowest-level group in the vertebrate subphylum. Fish meat is rich in animal protein and phosphorus, rich in nutrition, delicious, easy to be digested and absorbed by the human body, and has a significant role in the development of human physical strength and intelligence.

Other parts of the fish body can be made into cod liver oil, fish gelatin, fish meal, etc. Some fish, such as goldfish and tropical fish, have a variety of bodies and bright colors, and have high ornamental value. Fishing is a sport that is beneficial to physical and mental health and is loved by people all over the world.

In addition, certain fish such as mosquito-eating fish are beneficial to human health by eliminating vectors such as malaria and yellow fever.

Classification Fish are generally divided into two categories: jawless and jawed.

Jawless vertebrae are cylindrical and lifelong and have no upper and lower jaws. The gills originating from the endoderm are sac-shaped, so they are also called cysts; The brain is well developed, generally with 10 pairs of cranial nerves; There are pairs of visual and auditory organs. The inner ear has 1 or 2 semicircular canals.

There is a heart, red blood; The epidermis is made up of multiple layers of cells. The even-fins are underdeveloped, and some archaeotic beetle fishes have pectoral fins. There are different classifications of jawless species, but they are generally divided into:

Hagfish, headfish, lamprey, finned turtle.

Jawed animals have upper and lower jaws. most have pectoral and pelvic fins; The endoskeleton is well developed, the adult notochord is degenerate, with a spine, and rarely a bony exoskeleton. The inner ear has 3 semicircular canals.

Gill are formed by ectodermal tissue. It is composed of shieldfish, cartilaginous fishes, echinosaurs and bony fishes. Among them, there are only fossil species of the class Shieldfish and Acanthida.

It is distributed all over the world, mainly inhabiting low-latitude sea areas, and some species inhabit freshwater. The extant species belong to the subclass Plategill and the Holocephalic subclass. There are about 600 species of plategill subclass, about 180 species in China, and most of them in the South China Sea.

There are about 30 species in 3 families and 6 genera in the whole subclass, and about 5 species in 3 genera and 2 families in China. The endoskeleton of the bony fish class is ossified, with bony sutures, and the head is often covered with membranous bones, and the body is covered with hard or bony scales. It is the most abundant branch of living fishes, which can be divided into three subclasses: total finned subclass, lungfish subclass and radial fin subclass.

The radial-fin subclass is the largest group. Among them, perciformes have the most species, except for cypriniformes, which are distributed in freshwater and salmoniformes, which are mostly anadromous fishes, and the other orders are mainly distributed in the ocean. Herring and cod are the highest in world fishery production today, followed by cod, which accounted for nearly half of the world's total fishery production that year.

There are more than 2,000 species of bony fish in China's coastal waters and more than 700 species of freshwater bony fish.

Fish body structure and life activities Although fish are the lowest vertebrates, they already have quite complete organ systems such as bones, muscles, digestion, circulation, respiration, excretion, reproduction, and neurosensory, and can carry out extremely diverse life activities. In addition to being related to phylogeny, its morphological structure also reflects its adaptability to the water environment.

Fishes are taxonomically derived from the fauna Phylum Halophyta, Chordates, Chondriches and Bony Ichthyidae. Taxonomy is more advanced than invertebrates, more advanced than primitive chordates such as sea squirts, and animals such as amphibians and reptiles are higher than fishes.

We can see from the evolutionary tree on the legend that the cartilaginous fishes have a common ancestor, and the bony fishes also have a common ancestor, which in turn has a common ancestor with other vertebrates (chordates, primitive chordates).

So fishes evolved from primitive chordates.

Of course, primitive chordates evolved from invertebrates, and there are various ancestors going forward, but all the current five kingdoms (animal and plant protobacteria archaea) evolved from Luca (latest common ancestor).

Did human life evolve from fish?