Then the emergence of life on to land rather than confined to the oceans. Soon after, the first vertebrates appear. On a scale of evolution, this period in the timeline of life on earth was by far the most exciting and vital. In the Cambrian, the first-time animals with mineralized skeletal systems lived. It’s a period is known as the Cambrian explosion. Suddenly, and seemingly out of nowhere, large numbers of species started appearing. These newly formed organisms would evolve into all forms of life on earth today.ĥ40 million years ago a mysterious event occurred. Here was a critical period of the evolution of planet earth. They evolved from simpler organisms to have different types of cells with individual functions. It’s unknown why, but around 900 million years ago simple multi-celled organisms started to appear. All life was single-celled organisms, made up mainly of bacteria and algae. Here the early stages of photosynthesis began.įor more than a billion years, the timeline of life on earth existed in primal forms. The efforts of these microbes created the conditions for all other life to evolve across the earth.Ģ.1 billion years ago more sunlight was starting to penetrate the earth’s toxic atmosphere.Ĭyanobacteria, named after their blue/green color- were the first to start exhaling oxygen. They process the other chemicals that were abundant in the early atmosphere and oceans. These anaerobic organisms lived in the absence of oxygen. The fossils were once part of a now-extinct seabed and thought to be the remains of ancient microbes. They were found preserved in ancient rock samples from Greenland. The earliest fossil evidence of life on earth dates to 3.7 billion years ago. It makes sense the first signs of life on planet earth are incredibly simple. The struggle started and soon after earth’s formation, organisms start appearing. In the beginning, survival was difficult for any life forms. The timeline of life on earth begins over 4.5 billion years ago. What was the first form of life on Earth? Our planet’s evolution started with the first organism ever to call our planet home. In this article, we’ll outline the timeline of life on earth. So how did it end up this way, and who lived before us? We, humans, are currently sharing the earth with about 12 million other species. Of all of those living life forms, an estimated 99% of all species are now extinct. Monkeys to humans, the evolution of life is a story with surprising twists.Įarth has been home to over five billion different species of organisms.
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