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Photosynthesis of Prokaryotes happened 3.5 Billion years ago. The first Prokaryotes evolved far down in the ocean in massive vents that provided them with chemical & heat energy. Some cells moved to the ocean surface & evolved to use more abundant energy from the sun. Life spread to many more places because of a energy bonanza. Oxygen is a byproduct of photosynthesis. Our atmosphere transformed from one rich in carbon dioxide to one rich in oxygen.

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Emergence of Eukaryotes happened 2.5 Billion years ago. Eukaryotes are more complex cells whose DNA is locked up inside of the nucleus. The nucleus helps protect & preserve genetic information. Eukaryotes contain tiny organs called organelles. They can thrive in Earth's increasingly oxygen-rich atmosphere while Prokaryotes perished.

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The First Multicellular Organisms came 1 Billion years ago. Different eukaryotes were used to form even more complex life-forms. The organisms could contain billions of cells that all have different functions but all share the same DNA. Multicellular organisms could respond to changes in the environment, in completely different ways. Then further developing a survival trait of life called homeostasis.

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The development of brains happened 500 Million years ago. Special Nerve cells began to cluster at the head and down the spinal cord to form the first brains. Organisms could process more information with brains. Organisms reacted in more complex ways which enabled more activities. Organisms were then able to think and have consciousness.

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Organisms were able to move from ocean to land 475 Million years ago. Plants and fungi left the ocean to live on land. The new environment was rich in new opportunities for organisms so they could survive. The organisms had to develop special skins to avoid drying out, ways to breathe out of water an new ways to reproduce. These organisms living on land is just like if we were to try and live in space.

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Mammals came along 250 Million years ago. The first animal to live on land was a modern lungfish, but over land animals soon evolved, like amphibians. Amphibians still need to be able to return to the water so they can reproduce but then came reptiles. Then mammals appeared on Earth. Mammals are warm blooded, furry and don't lay eggs.