It was necessary for life to exist on Earth, that organisms’ possess the ability to pass, store, and pass on molecular information to the next generation develop. The two molecules capable of these two processes are RNA and DNA. What probably accounts for the switch to DNA-based genetic systems during the evolution of life on Earth?

it has one origin of replication, but it proceeds in two directions - d)

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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explanation: