Question

which organism is believed to have evolved from the endosymbiotic relationship between a host cell and bacteria? archaea ribosome chloroplast

Explanation:

The endosymbiotic theory suggests that eukaryotic organelles like chloroplasts (and mitochondria) evolved from symbiotic bacteria. Archaea are a domain of single - celled organisms, not formed from this specific endosymbiotic relationship with a host cell and bacteria in the way organelles are. Ribosomes are cellular structures, not organisms or organelles formed via this endosymbiotic process. Chloroplasts are believed to have evolved from cyanobacteria - like bacteria living in a host cell.

Answer:

Chloroplast