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400 million years ago, Prototaxites might have towered high above all other terrestrial life. Ever since its discovery, we've been trying to figure out what this massive ancient organism could possibly have been. For a while the leading theory was that it was a fungus, but recent studies suggest Prototaxites might have been something we've never seen before...
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Sources: https://docs.google.com/document/d/e/2PACX-1vRW6hTUXV7yIO9-ucToXvgcm75TZ4L-1roCpkpUb9JpiEKzHd5arIxPW8NuApK5sIukMWRuqhiP46yf/pub