Two life forms merge into one organism in a phenomenon that occurs once in a billion years
Primary endosymbiosis, or two life forms merging into one, has occurred only twice in the history of Earth. The first time, it gave rise to all complex life as we know it through mitochondria. The second time, it caused the emergence of plants.
An international team of scientists have observed the evolutionary phenomenon between a species of algae commonly found in the ocean and a bacterium
The first time we think it happened, it gave rise to all complex life.
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