Examlex
Which of the following is a true statement
Fossils
Preserved remains, impressions, or traces of once-living organisms from the distant past.
Cyanobacteria
Photosynthetic microorganisms found in water, sometimes referred to as "blue-green algae," important for their role in nitrogen fixation and oxygen production.
Oxygen-rich Atmosphere
An atmosphere that contains high levels of oxygen, typically associated with the development and sustenance of complex life forms on Earth.
Carbon Dioxide-rich Atmosphere
An atmosphere that contains a high concentration of carbon dioxide, affecting climate and living organisms.
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