What is the oldest living creature?

US scientists have recently discovered the world's oldest microorganism, which has existed for 250 million years, breaking the current record for the oldest organism on Earth and providing the latest justification for the theory that life on Earth may have originated in outer space.

The bacteria, called 2-9-3, is naturally sealed in a salt crystal and is found in a nuclear waste landfill 2,000 feet underground in the desert of New Mexico, USA. Scientists at the University of West Chester in the United States took the bacteria out of the salt crystals in a sterilized environment, and then used a co-catalyst extracted from Anji acid to revive the bacteria that had entered a state of suspended animation.

The researchers first disinfected the surface of the salt crystal, killing the modern bacteria attached to it, and then carefully removed the bacteria from the crystal in a sterilized environment. The researcher explained that this was done to ensure that the bacteria in the crystals did not sneak in by accident during the experimental analysis.

The researchers claim that since the crystal showed no signs of damage, and because it came from a salt crystal that formed 250 million years ago, they believe that the bacteria sealed inside are the same age as the salt crystal, i.e. about 250 million years old. They claim that according to their rigorous disinfection procedures, the bacteria inside the crystal are accidentally contaminated with a chance of only one in a billion. Prior to this, the oldest microorganism on Earth, found on bees preserved in amber, was estimated to be about 25 million to 40 million years old.

Nautilus, horseshoe crabs, sharks, crocodiles, cockroaches, etc., were all there hundreds of millions of years ago

It should be a human being, there is no one before and no one after him.

The oldest living organism is cyanobacteria.

Cyanobacteria are prokaryotes, also known as blue-green algae or cyanobacteria; Most cyanobacteria have colloidal coatings on the outside of their cell walls, also known as sliminobacteria. Among algae, cyanobacteria are the simplest and most primitive single-celled organisms, such as microcysts, candida, anaanaea, etc.

Cyanobacteria do not have a nucleus, and the cells have nuclear substances, which are usually granular or reticulated, and the pigments are evenly distributed in the cytoplasm. Nuclear substances do not have a nuclear membrane and nucleolus, and have the function of a nucleus, so they are called prokaryotes (or pseudonucleus). Cyanobacteria contain circular DNA plasmids that act as carriers.

The phylum Cyanobacteria is divided into two classes: Chromococcus and Algae. Chromococcus algae are unicellular bodies or colonies; The algal body of the algal segment is a filamentous body with a phygal segment.

Cyanobacteria appeared on Earth about 3,533 billion years ago, and about 2,000 species of cyanobacteria are known, and about 900 species have been recorded in China.

Cyanobacteria do not possess organelles such as chloroplasts, mitochondria, Golgi apparatus, centrosomes, endoplasmic reticulum, and vacuoles, and the only organelles are ribosomes. Contains chlorophyll a, no chlorophyll b, contains several lutein and carotene, and also contains phycobilin (is a general term for phycoerythrin, phycocyanin and allocyanin).

Generally speaking, where the amount of chlorophyll a and phycocyanin is large, the cells are mostly blue-green. Similarly, there are a few species that contain more phycoerythrin, and the algae body is mostly red, such as a kind of cyanobacteria born in the Red Sea, called Red Sea Bundle Trichophyllus, because it contains a large amount of phycoerythrin, the algae body is red, and the reproduction is also fast, so the sea water is also red, and the Red Sea is named after it. Although cyanobacteria do not have chloroplasts, they can be seen under electron microscopy that there are many photosynthetic sheets in the cytoplasm, which are called thylakoids.

The oldest organisms date back to about 3.8 billion years ago on Earth, and these creatures are calledProkaryotes.

They are the first single-celled organisms to appear. Prokaryotes are a class of organisms that do not have a eukaryotic nucleus, and their genetic material is directly present in the cytoplasm. Prokaryotes include bacteria and cyanobacteria, among others, which have been on Earth much earlier than eukaryotes.

Prokaryotes survive in a very simple way, they mainly survive by absorbing nutrients from their surroundings. In the early Earth, oxygen levels were very low, so prokaryotes survived mainly through anaerobic metabolism. With the passage of time, the oxygen content gradually increased, and the prokaryotes gradually evolved the ability of oxidative metabolism, which also provided an important basis for the later biological evolution.

In addition to prokaryotes, there are some very ancient organisms on Earth, such as sponges, corals, etc. These organisms appeared about 600 million years ago during the Cambrian period, and they were the first multicellular organisms. Organisms such as sponges and corals have a very simple body structure, they have no real tissues and organs, but their existence provides an important foundation for later biological evolution.

Overall, the oldest organisms are prokaryotes, which are one of the earliest life forms on Earth. Over time, organisms have evolved and more and more complex forms have emerged, which also provides the basis for the rocky, lead-like nature of life on Earth.

Cyanobacterial cells: 3.5 billion years old, they are the oldest known fossils of cyanobacteria, found to rot in the Archean Rocks of Western Australia. Cyanobacteria are also known as blue-green algae, which are bacteria that use photosynthesis to generate energy.

Sponges: Billion-year-old fossils of glass sponges found in rocks in Australia, China and Mongolia. Because its bones are composed of relatively soft sponge scleroprotein, it is not easy to form fossils.

Jellyfish: 100 million years old, its body is almost composed of water, and it is difficult to form fossils. <

1. Cyanobacterial cells: 3.5 billion years old, they are the oldest known fossils of cyanobacteria and have been found in the Archean Rock of Western Australia. Cyanobacteria are also known as blue-green algae, which are bacteria that use photosynthesis to generate energy.

2. Sponge: 100 million years old, fossils of glass sponges have been found in rocks in Australia, China and Mongolia. This type of fossilized sponge is rarer than other types because its bones are composed of relatively soft sponge hard protein, making it less likely to form fossils.

3. Jellyfish: 100 million years old, its body is almost composed of water, and it is difficult to form fossils.

4. Horseshoe crab: 100 million years old, known as a living fossil, the oldest horseshoe crab fossil can be traced back to the Ordovician. These marine arthropods inhabit mainly soft sandy or muddy bottom shallow waters.

5. Coelacanth: 400 million years old, it is a rare fish. It is a close relative of lungfish, reptiles, and even mammals. The last time a live coelacanth was found was in 1988.

Top 10 surviving animals in the world.

1. Wrinkled gill shark - 100 million years ago.

The crossing between sharks and eels is disturbing. The frilled shark has survived for nearly 100 million years and is one of the top 10 living prehistoric animals. Luckily, it just hangs out near the bottom of the ocean.

The frill shark is a primitive shark and is the only species of shark in the genus Frillills of the family Frigills. Because of its extended gills and folds covering each other, it is called the frilled shark.

2. Tadpole shrimp - 100 million years ago to the present.

I admit it may not seem terrible, but it's been living for hundreds of millions of years? It is one of the top 10 living prehistoric animals. It's hard to think that this thing has survived to this point.

Tadpole shrimp, also known as three-eyed dinosaur shrimp, has actually experienced several radiation and extinction events. But they survived.

3. Coelacanth - 100 million years ago to the present.

Coelacanths are fishes of the order Coelacantha that contain the oldest submandibular phylum branches. The coelacanth species is thought to have been completely extinct at least 65 million years ago at the end of the Cretaceous period. It is one of the top 10 living prehistoric animals.

This idea was only shattered in 1938 after the discovery of speartail fish in South Africa. The two extant species of speartail fish are therefore also known as living fossils.

Most people think that this 100-million-year-old fish is a long-term extinction. There was only one sighting reported in 1938 ......Until the last 10 years, when fishermen kept discovering them.

The oldest living creature on Earth.

1. Published in 1989, the book "Wonderful Life" revealed the biological characteristics of the world's earliest organism - the Cambrian period, and 24 years later, two authoritative scholars in the field of paleontology, Doug Irving of the Smithsonian Institution and James Valentine of the University of California, Berkeley, jointly published a new book, "The Cambrian Explosion of Species: Constructing Biodiversity", which synthesized previous and latest research evidence and expounded the evolutionary process of the world's earliest organisms.

2. At present, paleontologists have discovered that the history of ancient organisms can be traced back to 100 million years ago, and the lifestyle of these earliest organisms on Earth was very much like that of today's sponges, with roots rooted in the ocean floor and filtering food particles in the water.

3. It took about 100 million years for new populations to emerge. These include some identifiable populations of organisms, while others are so peculiar that paleontologists consider to belong to extinct populations. After about 100 million years, fossils began to appear in large numbers, and many of the animal populations we have found, such as:

The phylum Chordates from the Cambrian period have all appeared. However, there are many species of Cambrian fossils that are not quite the same as modern organisms, and their restoration effect is very strange and strange.

Fourth, there may have been some triggers in the Cambrian species explosion, and they explained the reason why the earth's natural world suddenly became a sudden increase in species, and the earth has undergone many drastic changes over millions of years, including: the global ice age, the sudden increase in ocean oxygen levels, the emergence of predatory species, and the emergence of new defense strategies for organisms. In addition, there is another evidence of Cambrian biodiversity – the DNA of animals themselves, which evolved into genetic programs that can evolve a single egg cell into a complex living organism.

5. Some of the earliest creatures in the world.

1. Obabin scorpion: The obabin scorpion has 5 eyes and an appendage extending from the head.

2. Fuxian Lake Worm: Fuxian Lake Insect is an ancient species close to modern insects and other arthropods.

3. Strange shrimp: Strange shrimp is a huge creature in the Cambrian period, which can reach 1 meter long.

The first living things in the world were microorganisms.

Cyanobacteria are ancient organisms, about 3 billion years ago, the earth was originally an oxygen-free environment, and the transformation of the earth from an oxygen-free environment to an aerobic environment was caused by the emergence and oxygen production of cyanobacteria. This is evidenced by the discovery of a large number of fossilized stromatolites (about 3 billion years old) formed by the growth of cyanobacteria (such as spirulina) in the Precambrian crust and molecular fossils (biomarkers) representing the presence of cyanobacteria in 2.7 billion years old black shale.

1. Morphological characteristics.

The cells of cyanobacteria are generally larger than bacteria, usually 3 10 m in diameter, and the largest can reach 60 m, such as Cyanobacterium macrotremor. According to the differences in cell morphology, cyanobacteria can be divided into two categories: unicellular and filamentous. Unicellular taxa are mostly globular, elliptical and rod-shaped, solitary or agglomerates, such as cosus cyanobacteria and peel cyanobacteria; Filimental cyanobacteria are a group of many cells arranged in an arrangement, including:

Those with heteromorphic cells (e.g., Anabay cyanobacteria), those without heterocytes (e.g., Cyanobacterium trembling), and those with branches (e.g., Cyanobacterium fischerii).

The cell structure of cyanobacteria is similar to that of gram-negative bacteria. The cell wall has two layers, the outer layer is the lipopolysaccharide layer, and the inner layer is the peptide polymer layer. Many species can continuously secrete a gum outside the cell wall, holding together a group of cells or filaments to form a mucous glycocoat or sheath.

The cell membrane is monolaminated with few mesosomes. Most cyanobacteria are flagellar but can "glide".

The sites of photosynthesis in cyanobacteria, called thylakoids, are numerous and are distributed in parallel or coiled fashion close to the cell membrane, which contain chlorophyll and phycobilisin, a class of auxiliary photosynthetic pigments. The cells of cyanobacteria contain glycogen, polyphosphate, and cyanobium peptides, as well as immobilized carbosomes, and a few aquatic species also contain bubbles.

In terms of chemical composition, cyanobacteria are most unique in that they contain unsaturated fatty acids composed of two or more double bonds, while bacteria usually contain only saturated fatty acids and unsaturated fatty acids with one double bond.

The earliest organisms found in the world today are viruses. It has the simplest structure and is made up of only protein shells and RNA. But this conclusion has not been confirmed, because, if it was the first creature, then on whose body did it parasitize?

The Spore House owner remembers to take the satisfactory answer.