What has only prokaryotic cells?

Bacteria and Archaea are the only prokaryotes. Organisms with eukaryotic cells are called eukaryotes.

Prokaryotes Examples :

Escherichia Coli Bacterium (E. coli)

Streptococcus Bacterium.

Streptomyces Soil Bacteria.

Archaea.

the oceanic zone is typically defined as the area of the ocean lying beyond the continental shelf, but operationally is often referred to as beginning where the water depths drop to below 100 meters (328 feet), seaward from the coast to the open ocean.

explanation:

you should wear a lead protective shield when having teeth x-rays

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-lavira : )