Question

which organelle is believed to have evolved through an endosymbiotic relationship with bacteria? mitochondria ribosome viruses

Explanation:

The endosymbiotic theory suggests that mitochondria (and chloroplasts) evolved from free - living bacteria that were engulfed by a host cell. Ribosomes are cellular structures for protein synthesis and not believed to have evolved via endosymbiosis with bacteria. Viruses are not organelles. So the organelle that evolved through an endosymbiotic relationship with bacteria is mitochondria.

Answer:

A. Mitochondria