What did Margulis' endosymbiotic theory suggest?
Organelles were once bacteria
Life originated from comets
Life is a simulation
Life evolved from clay
Answer
Margulis' endosymbiotic theory proposed that organelles, such as mitochondria and chloroplasts, were once free-living bacteria that were engulfed by a larger cell. Over time, these bacteria lost their ability to live independently and became dependent on the host cell for survival. This theory explains the presence of their own DNA and ribosomes within organelles, which are distinct from the host cell's DNA.
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