According the endosymbiont theory we can reason that the merging event that led to the mitochondria occurred before the merging event that led to the chloroplast because all eukaryotic cells which have chloroplasts also have mitochondria, but all cells that have mitochondria do not necessarily have chloroplasts.

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The endosymbiont theory suggests that mitochondria were acquired first through a symbiotic relationship between an ancestral eukaryotic cell and a bacterium capable of aerobic respiration. This is supported by the observation that all eukaryotic cells, including those with chloroplasts (for photosynthesis), have mitochondria, but not all eukaryotic cells have chloroplasts. This implies that the symbiotic event leading to mitochondria occurred before the event leading to chloroplasts.

According the Endosymbiont Theory We Can Reason That the Merging