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The question tells about evolution of eukaryotic cells.
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3 .5 billion years ago, single -cell organisms appeared on the earth.
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Billion years after earth formed.
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This is explained by the endosymbiotic theory.
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Endosymbiasis came about when large cells engulfed small cells.
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The small cells were not digested by the large cells.
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Thus, they lived within the large cells and evolved into organelles.
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The large and small cells formed a symbiotic relationship.
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I will explain this symbiotic relationship with diagram.
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This diagram shows symbiotic relationship between small cells and large cells.
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This is the ancestral procrears.
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There is no organelles inside the cell.
02:38
Enfolding of plasma membrane to form a nucleus.
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Aerobic bacteria and arcan bacteria enters into the large cell.
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Large cell.
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This aerobic bacteria break down the large cells waits for energy...