Endosymbiosis
[en-doh-sim-bee-oh-sis, -bahy-] /ˌɛn doʊˌsɪm biˈoʊ sɪs, -baɪ-/
noun, Biology.
1.
in which one symbiont lives within the body of the other.
/ˌɛndəʊˌsɪmbɪˈəʊsɪs/
noun
1.
a type of symbiosis in which one organism lives inside the other, the two typically behaving as a single organism. It is believed to be the means by which such organelles as mitochondria and chloroplasts arose within eukaryotic cells
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