According to the endosymbiont theory:   a)  modern plant cells are able to carry out photosynthesis because their ancestors engulfed cyanobacteria.   b)  chloroplasts and mitochondria evolved from prokaryotic cells.   c)  ancestral eukaryotic cells acquired the ability to carry out aerobic respiration as a result of engulfing aerobic bacteria.   d)  a and c   e)  a, b and c

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