The correct answer is D. The domain is the broadest category in the classification of living organisms. All the living organisms are placed in three domains, which are archaea, bacteria and eukaryotes. The prokaryotes are separated into two groups, that is archaea and bacterial based on the differences in their 16S rRNA genes. Amoeba is classified as an eukaryotes because, its cell is more developed than that of bacteria.
A dominant part of aquatic animals like fish and prawns inhale through uncommon organs called gills.
The skin that help in utilizing oxygen broke up in water. which help in return of gases and Gills contain veins.
Amphibian life forms have a unique organ called gills, which permits them to inhale oxygen in the water.
The two sides of the pharynx (throat) by the Gills when the gases exchange in fish .
<em>Gills are tissues that resemble short strings, protein structures called fibers. </em>
These fibers have numerous capacities including the exchange of particles and water, just as the trading of <em>oxygen, carbon dioxide, acids and alkali.</em>
