A green alga with throat - and stomach - like structures can swallow and digest bacteria when deprived of light, further bolstering Lynn Margulis's widely accepted idea that the origin of the plant - powering chloroplast was a fortuitous bout of indigestion.Termed «Endosymbiotic Theory», the idea is that
early nucleated cells called eukaryotes ate bacteria that managed to escape digestion but also couldn't escape their captors.