Humans are the least existing creatures on Earth
The Earth was formed from rocks and dust approximately 4.54 billion years ago
The origin of life on Earth dates back exactly 3.8 billion years. Davide Pisani and his colleagues, from the University of Bristol in the United Kingdom, collected genetic data from 102 species of organisms and built a family tree, showing how these organisms are related to each other.
Life diversified over the next billion years, and according to Pisani's study, the first great division occurred 3.4 billion years ago. This yielded two groups of microorganisms, namely bacteria and archaea (archaebacteria).
?Where did oxygen appear on the surface of the Earth
During the first two billion years of Earth's history, there was no free oxygen in the atmosphere. Rather, it was associated with metals and other chemicals, because it easily reacts with different elements. However, that all changed 2.4 billion years ago, with the Great Oxygenation Event.
This first "ice Earth" era began just after the appearance of oxygen in the air, and lasted until 2.1 billion years ago. Atmospheric oxygen played a role, by reacting with methane produced by methanogens, reducing the methane effect.
Dickinsonia was an animal, the oldest known, half a billion years ago.
The lifespan of humanity is considered very short compared to the time period that dinosaurs lived.Humans appeared on Earth only about 200,000 to 300,000 years ago. While dinosaurs lived on Earth for approximately 165 million years, from about 230 million years ago until their extinction about 65 million years ago.
So, if we look at geological time, the existence of humans is equivalent to a very short glimpse compared to the long period that dinosaurs lived. This huge difference in time makes the evolution and modernity of man compared to the history of life on Earth clear.
Source: websites