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There’s something you probably heard a lot in biology class. And no, it's not “mitochondria is the powerhouse of the cell”...

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Journey to the Microcosmos is a Complexly production.
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SOURCES:
http://tolweb.org/Euglenida/97461
https://pubmed.ncbi.nlm.nih.gov/22401...
https://europepmc.org/article/med/233...