About how long did microbes exist on Earth before the evolution of the first multicellular organisms, according to the geologic record?

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The geologic record suggests that microbial life has existed on Earth for around 3.5 billion years, while the first evidence of multicellular organisms dates back to about 1.2 billion years ago. Therefore, microbes existed on Earth for about 2.5 billion years before the evolution of the first multicellular organisms.

About How Long Did Microbes Exist on Earth Before the Evolution