When the Elder Things arrived on Earth during the Archean Eon, approximately 4.0 to 2.5 billion years ago, the only life on our planet was prokaryotic in nature. These relatively simple bacterial cells lacked organelles. However, the Elder Things used these bacteria cells as raw material for bioengineering. Specifically, this involved a process called endosymbiosis, where various bacterial cells were merged or fused together to make more complex cells called eukaryotes. Thus, many of the organelles in eukaryotic cells, such as flagella, mitochondria, and chloroplasts, were once bacterial cells. DNA and RNA comparisons between living bacteria and the residual genetic material found in these organelles within eukaryotic cells, provide strong evidence for this theory. Animals, plants, fungi and protists are all eukaryotic forms of life and were created by the Elder Things through endosymbiosis.
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