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Started 3.5 Billion years ago Through Prokaryotes. Photosynthesis is where plant-like organisms floated to the surface so the sun would hit them, and help with photosynthesis which helped provide oxygen.

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Eukaryotes can survive the increasing levels of oxygen, while most Prokaryotes begin to perish. Happened approximately 2.5 Billion years ago. Eukaryotes are important to Pterodactyl Life because they are made up of Eukaryotic cells.

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1 billion years ago. Makes homeostasis easier and is important to the Pterodactyl because the Pterodactyl is a multicellular organism, and needs homeostasis to survive. Multicellular organisms start to adapt to new developments.

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500 Millions Years. VERY Important. Without it, there would be no life. Organisms begin to understand more complex things.

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475 Million Years ago. Some organisms begin to live on land, making adaptations so their skin doesn't dry out. If this wouldn't have happened, there would be no land animals.

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250 Million Years ago. Most Important to Humans.Without mammals, we wouldn't have as many food resources, or we wouldn't exist at all.