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3.5 billion years ago. the first prokaryotes formed in this era, some surfaced and used sun as energy, creating photosynthesis. this allowed life to grow, also creating oxygen. oxygen was poisonous to most species and caused them to die off, making a new abundance of species.

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2.5 billion years ago, eukaryotes are more complex cells. inside the cell there are little organs called organelles that function like photosynthesis. humans are made up completely by eukaryotes.

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1 billion years ago. different eukaryotes came together to form more complex forms of life. they could contain billions of cells, each with their own function. the new life could adapt to their new environment, and led to instincts and survival traits called homeostasis.

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500 million years ago, the cells needed a way to coordinate their activities, thus creating new complex nerve cell we know as brains. brains allowed the organisms to process much more complex information.

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475 million years ago. plants and fungi left the ocean for land, the land had more opportunities for survival. they developed a special kind of skin to prevent them from drying out.. ways to breathe out of water, and new ways to reproduce.

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250 million years ago, the first animal to live on land may have been a lungfish. some animals evolved into amphibians, still needing to return to water for reproduction... eventually evolved into reptiles. the first mammal to walk on earth came from a branch of reptiles. mammals are warm blooded, furry and do not lay eggs.