Life on Earth kept to darkness for much of history, study finds
7/18/2018 02:30:00 PM
Tiny creatures that lived in the dark - either underground or below the sea floor - were the dominant life forms on Earth for much of the planet's history, a study suggests.
Microscopic organisms, including bacteria, were the most abundant forms of life on Earth from about 2 billion years ago until 400 million years ago, when plants began to spread across the land, researchers say.
During this era, these organisms weighed around 10 times as much as all other life on the planet combined, according to the study, which offers insight into the evolution of life on Earth.
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