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OpenStudy (anonymous):
What observation led researchers to propose that chloroplasts evolved from cyanobacteria? A.Both produce proteins. B.Both contain mitochondria. C.Both provide structure to cells. D.Both provide structure to cells.
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OpenStudy (bioepic):
I think it is A
OpenStudy (bioepic):
I am not sure for sure, check http://wiki.answers.com/Q/What_is_the_theory_of_endosymbiosis_and_how_did_mitochondria_and_chloroplasts_originate?#slide=13
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