Why do biologists think that endosymbiosis gave rise to mitochondria before plastids it is partly because?

Why do biologists think that endosymbiosis gave rise to mitochondria before plastids it is partly because?

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    Most eukaryotes evolved in such a way that they either gained or lost plastids. The organisms that gained plastids were those that required these plastids for photosynthesis, while those that lost these plastids did not perform the photosynthetic process.

    However, the mitochondria were essential for metabolizing several products, and hence they remained.

    Thus, scientists explained that endosymbiosis produced mitochondria before plastids. This is because all eukaryotes possess mitochondria but not all possess plastids.

    Therefore, the given statement is true.