what type of organism present on the earth at primitive years.
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The earliest life forms we know of were microscopic organisms (microbes) that left signals of their presence in rocks about 3.7 billion years old. The signals consisted of a type of carbon molecule that is produced by living things.
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4 billion years ago, a type of organism called cyanobacteria evolved on the early Earth and began carrying out photosynthesis. Photosynthesis uses carbon dioxide and energy from the Sun to produce sugar and oxygen
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