Question

which of the following are single - celled organisms?
○ bacteria only
○ eukarya only
○ both archaea and bacteria
○ archaea only

Explanation:

Archaea and Bacteria are both prokaryotic domains, and all known members of these two domains are single-celled organisms. Eukarya includes both single-celled (like yeast) and multicellular organisms (like plants and animals), so it is not only single-celled.

Answer:

C. Both Archaea and Bacteria