Chloroplasts and mitochondria have small,circular chromosomes,which supports the endosymbiont theory that they arose from which of the following?

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The fact that chloroplasts and mitochondria have small circular chromosomes supports the endosymbiont theory that they were once free-living prokaryotic cells that were engulfed by a larger, ancestral eukaryotic cell. It is believed that chloroplasts originated from photosynthetic bacteria while mitochondria originated from aerobic bacteria.

Chloroplasts and Mitochondria Have Small,circular Chromosomes,which Supports the Endosymbiont Theory