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Section 25.1

Across
A theory that states that mitochondria and plastids were formerly small prokaryotes that began to live within larger cells.
When a living cell engulfs another eukaryote cell that has already undergone primary endosymbiosis.
Down
Supposes that mitochondria evolved before plastids through a sequence of endosymbiotic events.
A symbiotic relationship in which one organism lives inside the body or cell of another organism.