What is the last ordinary predecessor?
"The last common predecessor" refers to the last possible shared ancestor between two individuals, species or groups of life. For example, the last ordinary predecessor of all animals existed that it existed about 610 million years ago, although it can be much older. We can draw some of his features by looking at common features that hold all living animals. For example, the foundations of cellular metabolism are held common among all animals.
There are two ways to find out the last common ancestor of two entities and both are imperfect. The first is to dig fossils and estimate your place in an evolutionary tree based on morphology and other tracks. This may fail because interpretations can be incorrect and the vast majority of all species have never left any fossils. The second is to look at the genomes of living animals and see how much information they have in common. The less shared genetic information, the more distant two are, and the thrust -shaped wipes can be used toestimate of the approximate time of divergence. This approach can also fail because species develop at different speeds that we cannot always predict.
If you want to get an idea of dating the last common ancestors, consider these characters. The last common predecessor of the whole life - sometimes called the last universal common predecessor or Luca - lived between 3.6 and 4.2 billion years, very long ago, even according to the standards of paleontologists. The last ordinary predecessor of animals lived at least 610 million years ago, as mentioned. The last common ancestor of all vertebrates was probably a fish without a jaw that lived 530 million years ago at the beginning of Cambian. The last common predecessor of all earthly vertebrates was a lobe fish, which began to crawl on Earth 375 million years ago. These fish are direct ancestors of all human beings.
the last common predecessor of all livingThe mammals existed at least 125 million years ago. The last common predecessor of all primates existed 55 and 85 million years ago, while the last common predecessor of hominids ("big apes": people, chimpanzees, orangutans and gorillas) lived for about 18 million years. Orangutans, gorillas and chimpanzees were divided from other primates 14, 8 and about 7 million years ago. Until recently, it was assumed that the ancestors of people were divided from chimpanzees 3-5 million years ago, but new fossil discoveries indicate that this divergence occurred before it was originally thought.
The last common predecessor of all living people lived only about 3,000 years ago, which was all very closely related. There is some confusion with the identification of "mitochondrial eva", which is assumed to be a matrilineal latest common ancestor (MRCA) of all living people who lived about 170,000 years ago. However, Matrilineal MRCA can only be hitchhiking over female DNA and cannot be directly connected as a common predecessor of all people.