Answer:
A. domains
Explanation:
Domains is placed higher than Kingdom in the Taxonomic rank.
Currently, domains are divided into three : Archea, Bacteria, and Eukaryota
Archea constitute of single cells organism that do not have a cell nuclei. Every single organisms have some sort of Archea in their microbiota.
Bacteria made up from collection of single cells organism that possess some sort of cell walls but lack organelles. Biologists believed that Bacteria were among one of the first life forms that exist on Earth
Eukkarryota made up of microorganism that possess membrane-bound organelles That can usually be found in in plants and algae;
