# data[].attributes.body
At this time, Earth barely had an atmosphere, mainly consisting of methane, ammonia, and some water vapor. As the planet got cooler, volcanic eruption released large amount of hydrogen, sulfide, methane, and carbon dioxide.

# data[].attributes.body
During this time period, there was no oxygen in Earth's atmosphere; only oxygen compounds like H2O. In this state, living organisms called "cyanobacteria" thrived in the oceans and started the trend of photosynthesis; the process of creating oxygen from a combination of carbon dioxide, water, and sunlight. This process filled the atmosphere with oxygen.

# data[].attributes.body
In this period, many life forms began to blossom through photosynthesis, producing enough oxygen to expel methane from the atmosphere.

# data[].attributes.body
In this time, Earth entered its Carboniferous period, with major plant life starting to flourish on the surface. With this, large amount of oxygen was pumped into the atmosphere, reaching up to 20-35%!

# data[].attributes.body
290 million years ago, Earth was a lot warmer than it is now, due to the climate changes made by the shifts in the atmosphere. Most wildlife actually lived in the North Pole, which had a much different climate than how it is now. Today, Earth has five layers of atmosphere, made of 21% oxygen, 78% nitrogen, and 1% other gases, while surface level and oceanic wildlife flourish in distinct communities.

# data[].attributes.body
-National History Museum
-National Geographic Society
-Forces of Change