What are believed to be the evolutionary ancestors of mitochondria?

Name: What are believed to be the evolutionary ancestors of mitochondria?
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Mitochondria are believed to have originated from ancient proteobacteria through a process called endosymbiosis, where a larger host cell engulfed a smaller bacterial cell, which then became a beneficial part of the host cell, eventually evolving into the mitochondria we see in eukaryotic cells today.

What Are Believed to Be the Evolutionary Ancestors of Mitochondria