from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A theory stating that the eukaryotes evolved through a process whereby different types of free-living prokaryotes became incorporated inside larger prokaryotic cells and eventually developed into mitochondria, chloroplasts, and possibly other organelles.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun ecology The theory that concerns the origins of
mitochondriaand chloroplasts, which are organellesof eukaryoticcells.
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