Question

analyze the diagram that summarizes the endosymbiotic theory. which of the following best describes the endosymbiotic theory of the origin of life? eukaryotic bacteria evolved from anaerobic prokaryotic cells that were released into the environment. prokaryotic bacteria evolved from anaerobic eukaryotic cells that were released into the environment. the prokaryotic organelles, known as mitochondria, were once free - living eukaryotic bacteria that were engulfed by another cell. the eukaryotic organelles, known as mitochondria, were once free - living, aerobic bacteria that were engulfed by another cell.

Explanation:

The endosymbiotic theory posits that mitochondria and chloroplasts in eukaryotic cells were once free - living prokaryotes. Mitochondria are thought to have originated from aerobic bacteria that were engulfed by a host cell. This symbiotic relationship led to the evolution of eukaryotic cells.

Answer:

The eukaryotic organelles, known as mitochondria, were once free - living, aerobic bacteria that were engulfed by another cell.