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About 4.5 billion years ago the solar system settled into how we know it today. Gravity pulled gases and dust and combined them to crate a planet. That planet is the third closest to the sun and now known as Earth.

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With an environment low in oxygen and high in methane, the Earth was not inhabited by the animals we know today. One of the first organisms on Earth were microbes or microscopic organisms. Scientists found traces of these organisms through carbon molecules.

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About 2.7 billion years ago the first eukaryotic cells evolved. Eukaryotic cells have a nucleus where the genetic material is separated from the cytoplasm. Bacteria had been inhabiting earth for billions of years before this, however they were less complex. Making this a large step towards future evolution.

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At least 2.4 billion years ago cyanobacteria became the first ever photo-synthesizers to live on Earth. They used sunlight to create energy and as a result, released oxygen. This caused a large increase in Earth's oxygen levels.

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It is suggested by DNA evidence that sea sponges were the first animals on Earth. The oldest fossilized sea sponge can only be dated back to 700 million years ago,but it is believed that they evolved before that. These sea sponges also started building the first reefs.

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The Charina was one of the most common organisms in the Ediacaran period. They attached themselves to the bottom of the sea floor. Although it had a leaf shape, scientists are still unsure it is is and animal, plant, or something else.

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Dickinsonia Costata were single-celled, flat, and circular-shaped,  aquatic organisms. Using the fatty molecules of these organisms scientists were able to discover their age. They lived about 580 million years ago during the Ediacaran period.

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Trilobites appeared at the beginning of the Cambrian period. These marine animals flourished in this time. However, their population greatly decreased in the next succeeding period due to an increase in predators.

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The Opabinia also lived during the Cambrian period. They were marine animals with five eyes, a backwards facing mouth, and a long nose. They were small creatures that only grew to about 4 to 7 cm long.  It is believed they are related to ancestral arthropods.

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Anomalocaris in Greek is translated to "unusual shrimp", which is exactly what they are. These marine organisms lived 530 million years ago during the Cambrian period. They grew up to 6 feet long and are equipped with amazing eyesight, swimming skills, and spiked limbs. They went extinct during the mass extinction at the end of the Cambrian period. They are related to the Ophabinia.

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With the help of sea sponges coral reefs began to develop 500 million years ago during the late Cambrian period. These coral reefs are not like the large, extensive, and bright coral reefs we know today. They were simple, solitary organisms.

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The Edaphosaurus or ground lizard lived during the Permian period. These organisms are believed to be herbivores. This makes them the first plant-eating synapsid of the Permian period.

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About 130 million years ago flowering plants bloomed. The first of these plants are the Archaefructus. It is believed they grew near bodies of water.  They are closely related to aquatic ferns, sea grasses, and the modern water lily.

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The Argentinosaurus is a herbivore that lived about 100 million years ago. It grew to be about 80 tons and 115 feet long. They were discovered in 1989 in Argentina, hence how they got their name.

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The Eohippus live about 56 to 34 million years ago. These mammals are commonly known as the dawn horse. They are the first known ancestors of horses in the line of Eohippus, Olgiohippus, Merychippus, Pliohippus, and finally modern horse. They were about the size of a dog, only 30-60 cm tall.

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About 115,00 years ago the first Homosapiens developed. The first evidence was found in southern Africa in the late Stone Ages. The evolution of humans as we are now has been occurring for 30 million years, starting with ape.

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Life on Earth has been evolving for billions and billions of years. From the start of Earth to the development of the human species and from mass extinctions to population spikes, the species inhabiting Earth have never stopped changing. It is important to protect our planet and make sure this process can continue for billions of years after us.