yuraavissel
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Mitochondria and chloroplasts are thought to have been ______.
a. free-living prokaryotes
c. protocells
b. early forms of eukaryotes
d. spontaneously generated

Respuesta :

a. free-living prokaryotes They were then endocytosed, which is part of the endosymbiotic theory. 
astauch
The correct answer is free-living prokaryotes. It is believed bacteria of some sort got into the prokaryote, and formed these two organelles.

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