According to the theory of secondary endosymbiosis, __________.
a. cells that had obtained their plastids through endosymbiosis were engulfed and themselves became plastids in heterotrophic eukaryotic cells
b. multicellularity evolved when primitive cells incorporated prokaryotic cells that then took on specialized functions
c. the symbiotic associations found in coral result from the incorporation of dinoflagellates into coral animal
d. the infoldings and specializations of the plasma membrane led to the evolution of the endomembrane system
e. mitochondria originated from a heterotrophic prokaryotic endosymbiont
Answer: a. cells that had obtained their plastids through endosymbiosis were engulfed and themselves became plastids in heterotrophic eukaryotic cells
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