Did the animals live in billions ago?
Most scientists agree that the first animals appeared about 600 million years ago, during the Ediacaran period. Simple oval fossil, only 200 microns on average, named Vernanimalcula ("small spring animal"), represents the first known fossil of the animal (although some scientists believe that fossil is a relic created by inorganic processes or fossils of giant bacteria).
Vernanimalcula was discovered in 2005 in a phosphatic fossil deposit in the Chinese province of Guizhou, known as Doushantuo. Doushantuo also has some fossils interpreted as an embryo dated 630 million years ago, just a few million years after glaciation Varangian/Marinoan, one of the most serious ice ages that animals in planetary history could have been before the previous previous than the previous previous, before it is preceded. more than preceded, thereforethat they are preceded because they are more than preceded because they are more than preceded to return as before to be previous than the previous ones because they were previous than the previous one, because they are more than preceded to be previous than the previous ones. A little more. Defenders of the Dryllenka point out that scientists have believed for more than a hundred years that the oldest animals came from the Cambrian period, but in 1957, after the discovery of the iconic fossil Charnia, it was realized that the animals lived up to 50 million years before Cambrian.
There are several evidence that indicates the existence of animals up to billions of years ago. One of them is a sudden decline in stromatolites about a billion years ago. Today, stromatolites are isolated into enemy areas to other life forms, such as extreme salty lagoons, because otherwise they are consumed. A sudden decline in the diversity of treeLitu over billions of years is proof that grazing animals have developed around that time. This hypothesis is supported by another decline in stromatoliths during the Evolutionary Evolutionary radiation, when a number of sea animals and flourishing stromatals have evolved immediately after the end and end Permian extinction.
Second evidence of the possibility of animals is billions of years ago comes from microscopic fossils called acritarch. Acritars represent a number of organisms, including resting cysts of eyelashes and possible embryos of early animals. Acritarchs appear in a fossil record about 2 billion years ago, but exploded in diversity and number about a billion years ago. There were also barbed acritarchs, which suggested adaptation to defend against predators. If there were no predators, why would the acritarchs suddenly develop the spine?
The third evidence of Metazoans is a billion years ago from trace fossils dated to this period. Trace fossils are small scratches on the ground, youRobed -moving animals, but some can be created by physical processes and incorrectly interpreted as the biological origin. Some trace fossils in India were dated 1 billion years ago. Some scientists who analyze these traces have concluded that they were made by worming metazoan up to 5 mm wide, passengers via and under the microbial mats that covered the seabed at that time. Other scientists disagree with this interpretation.
Whether the animals existed a billion years ago, it is a questionable topic. Many scientists question the possibility of observed absence of fossils of the body from this period. Any paleontologist who discovers the fossils of pre-edikáran would certainly become famous, but since 2008 such a fossil has not been found.