Researchers Find An Animal Without Mitochondria

Enlarge / Mitochondria, previously found in all animals, is now in all animals but one. (credit: NIH) Eukaryotes are the branch of the tree of life with complex cells, containing a separate compartment for DNA, lots of internal compartments, and mitochondria that use oxygen to provide lots of energy. These features were so successful that we can't find any trace of a eukaryotic ancestor that lacks any of them.

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