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Mini Threshold 6: Mammals: 250 Million years ago

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Mini Threshold 6: Mammals: 250 Million years ago

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One of the first types of animals to live on land were the animals that eventually evolved into amphibians, but they sometimes needed to return to the water so they could reproduce. Then eventually came reptiles, which developed large leathery eggs that could survive away from water. Then about 250 million years ago, mammals appeared.

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Mini Threshold 5: Life Moves To Land: 475 Million years ago 

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Mini Threshold 5: Life Moves To Land: 475 Million years ago 

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475 million years ago some multi-celled organisms left the oceans for land. This created a new environment which was rich in new opportunities. But different multi-celled organisms had to adapt and change their skins to avoid drying out, new ways to breathe out of water and reproduce.

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Mini Threshold 4: Development Of Brains: 500 million years ago 

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Mini Threshold 4: Development Of Brains: 500 million years ago 

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Multi-celled organisms found a way to coordinate different activities. This eventually became the work of special nerve cells, and in some organisms these cells decided to cluster at the head and down the spinal cord to from the first brain.These organisms reacted in more complex ways which enabled more sophisticated activity, which in this case is thinking and maybe even consciousness.

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Mini Threshold 3: Multi-celled organisms: 1 Billion years ago

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Mini Threshold 3: Multi-celled organisms: 1 Billion years ago

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This was the introduction of Multi-celled organisms. Different eukaryotes came together to form more complex life forms, and they could contain a billion cells. They could respond to changes in environment in entirely new ways, which developed a key survival trait that we call homeostasis.

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Mini Threshold 2: Eukaryotes: 2.5 Billion years ago

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Mini Threshold 2: Eukaryotes: 2.5 Billion years ago

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This is the emergence of eukaryotes. They processed oxygen which meant they could thrive in earths increasingly oxygen rich atmosphere. This was an important development since we're entirely made of eukaryote cells. The discovery of Eukaryotes was a big advancement in biology.

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Mini Threshold 1 : Photosynthesis : 3.5 Billion years ago 

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Mini Threshold 1 : Photosynthesis : 3.5 Billion years ago 

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This time was when about Prokaryotes formed in ocean vents. These cells migrated to oceans surface and evolved using photosynthesis. This enabled more life to spread across many different places. Our atmosphere eventually formed.