What do scientists call the largest taxo- nomic level of organization for organisms?
Adomains
B genera
C kingdoms
D phyla

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;

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