How did the world s first animal come about?

The world's first cloned sheep.

The reporter learned from Anhui Agricultural University on the 25th that the university's College of Animal Husbandry and Fisheries successfully implanted two xeno-cloned sheep embryos into ordinary goats more than three months ago, if nothing else, a month and a half later, the world's first xeno-cloned sheep will be born here.

According to Dr. Zhang Xiaorong, dean of the College of Animal Husbandry and Fisheries of Anhui Agricultural University, who led the study, xenoclone sheep embryos were cultivated with Boer goat somatic cells as donors and rabbit egg cells as recipients. They extract the nucleus from the ears of an adult female Boer goat, combine this somatic nucleus with the cytoplasm of rabbit egg cells, and then technically process the successfully hatched blastocysts to develop into early embryos. In November last year, they implanted such embryos into more than a dozen Huanghuaihai white goats.

Two of the goats were observed to be pregnant. Zhang Xiaorong said that the heterogeneous cloned sheep they bred will look the same as Boer goats.

It is understood that soon after the birth of the world's first cloned sheep "Dolly", Chen Dayuan, chairman of the Chinese Zoological Society, and others put forward the idea of xenomorphic cloning of animals. This cloning method is different from the "Dolly" allosomatic cell nuclear transfer, which simply means that the nucleus of the somatic cells of a type of animal is transplanted into the enucleated egg cells of a type B animal to give birth to a kind of animal. This is of revolutionary significance in biology, which will greatly broaden the application prospects of cloning technology, and has attracted wide attention from the international biological community.

This research from Anhui Agricultural University is at the forefront of the world in terms of technology. Zhang Xiaorong said that many scientists in the world are doing experiments on breeding xenomorphic animals, but very few xenoclone embryos can really be conceived in animals, and there are no xenoclone animals in the world at present. This study is of great significance for the exploration of nucleoplasm development, and plays an extremely important role in the reproduction and protection of rare animals.

Zhang Xiaorong told reporters that they also combined the ear somatic cell nucleus of cattle with the egg cytoplasm of rabbits, and successfully cultivated cloned embryos of cattle. For example, a Boer goat is worth tens of thousands of yuan, and the reproduction is very slow, if its somatic cells are taken, its genetic material is borrowed, and other animals are borrowed to give birth to Boer goats, and the prospects for industrial production are carried out by such xenoclone methods, which is quite attractive.

I guess it's evolved.

The cell goes from simple to complex, and then the mind goes from simple to complex.

Traditional mythology says that God created it.

It was born by his mother.

Specifically, from the ocean. Because the ancient sea had superior conditions than the land, and the ancient land environment was definitely a terrible hell, so the first creatures were born in the ocean.

Later, the movement of the earth's crust and the change of atmospheric composition caused many primitive animals and plants to migrate to the coastal zone to survive, and over time, various organisms continued to develop inland. And some creatures in the ocean continue to maintain their original characteristics and continue to evolve.

The first animals on Earth were called prehistoric organisms, cyanobacteria, and prehistoric organisms are the many organisms that lived on Earth, dating from about 3.8 billion years ago to about 3500 B.C., before humans began to keep written records. The morphology of prehistoric organisms ranged from bacteria-like cellular organisms in the ocean, to algae and protists, to more complex eukaryotic multicellular organisms such as fungi, plants, mollusks, insects, and vertebrates. About 3.9 billion years ago, primitive oceans appeared on Earth.

The original seawater, which is almost entirely water-watered, contains a large amount of organic matter, such as amino acids and nucleotides, which may have originally been owned by the Earth, or some from comets. Under the influence of the sun and other physical processes of the earth, peptide bonds appear in some organic matter, which in turn form proteins. In the hundreds of millions of years that followed, these proteins became more and more complex, and finally life began to emerge 3.4 billion years ago.

Sponges belong to the most primitive invertebrates in the animal kingdom, compared with other invertebrates, their structure is simpler, there are no heart, brain, head, mouth and other organs, only a variety of cells gather together to form the inner and outer two layers of body wall. There are two types of outer body wall cells, flat chaotic cells and ring cells. At one end of the ring cell is a small, rod-shaped cilia with a ring of arms, among which there is a long flagella like a whip, and the cell can constantly wave the flagella to continuously suck and spray water in, and at the same time stick the bacteria and microscopic organisms in the water to the flagella as their own food.

Flat cells have many pores, through which water flows into the cavernous body, so the sponge is also called a porous animal.

Ah, it was a long, long, long ......Before.

Some single-celled organisms do not have the means to synthesize organic matter on their own, so they choose to devour the surrounding material for their own use (or in other words, most cells can take in what they need from their surroundings, and these non-autotrophic single-celled cells can swallow more of their own matter than they can autotroph). ）

This is actually the most primitive animal, of course it is a protozoa, with only one cell.

You have to say that it is not counted, but that it is visible. Then the story continues.

These single-celled organisms inadvertently devour other single-celled cells, some of which help them with photosynthesis and some of which help them with aerobic respiration. These organelles that evolved over a long period of time to co-form these single-celled organisms.

With the ability of aerobic respiration, coupled with the fact that the oxygen content of the earth began to surge at that time, these single-celled organisms began to multiply in large numbers, not to mention photosynthesis, and some of them began to act in groups (and they are not to blame, the single-celled organisms at that time knew that they could not move flexibly when they thought about it), but gradually, these cells found that the cells in the middle often did not get much oxygen and died easily, while the peripheral cells had to face the impact of water and other shocks, and they were crumbling.

As a result, under natural selection, these cells gradually differentiated, some became tough and had a certain mechanical strength, and some were responsible for the transport of nutrients, which is the earliest cell differentiation.

At that time, the way to get nutrients was filter feeding--- water flowed in, and some cells actively grabbed the substances they needed from it.

And this is the most primitive multicellular animal--- porous animal phylum, and the sponge we see today belongs to this category