Archaea and eubacteria are primarily different in genetic make-up and biochemistry size and shape method of reproduction symbiotic relationships

in terms of living environments

Archaea  are primitive micro organisms that have one cell and live in environments that are severe, such as those that are extremely salty or hot.

They are any of a group of single celled prokaryotic organisms that have distinct molecular characteristics separating them from bacteria and from eukaryotes.

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above