EVERYDAY SCIENCE

Detailed explanation-1: -The correct answer is (c) Archaea and Eukarya. Scientists thought for a long time that Bacteria and Archaea were the most closely related domains of life, since they both consist of unicellular organisms.

Detailed explanation-2: -Bacteria encompass two domains: eubacteria and archaea. Eubacteria and archaea have very different cell walls. They are also distinguished by their DNA-the DNA of archaea has histone proteins while that of eubacteria does not.

Detailed explanation-3: -According to the ‘three-domains tree’, the Eukarya and Archaea are more closely related to each other than they are to the Bacteria (Fig.

Detailed explanation-4: -Archaea and bacteria are two different domains of cellular life. They are both prokaryotes, as they are unicellular and lack a nucleus.