Archaea bacteria are different from eubacteria largely by

a)nucleus
b)genome
c)organelles
d)organelles and nucleus

B)Genome

Explanation:

Archaea (Archaea) are single-celled microorganisms. Like bacteria, archaea lack a nucleus and are therefore prokaryotic. However, the differences at the molecular level between archaea and bacteria are so fundamental that they are classified into different groups. In fact, these differences are greater than there are, for example, between a plant and an animal. Currently, archaea are considered to be phylogenetically closer to eukaryotes than to bacteria.

Eubacteria are also known as "true bacteria", they are microscopic organisms that have prokaryotic cells. Because of their prokaryotic cells, they have a rigid cell wall, but they don't have mitochondria or other large organelles; They only have one chromosome, which is not found in the nucleus. Most of them reproduce asexually