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(A) The three-domain system,proposed by Carl Woese,classifies life into three domains: $Bacteria$,$Archaea$,and $Eukarya$. This system is primarily ba

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Differences in $DNA$ nucleotide sequences.

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(A) The three-domain system,proposed by Carl Woese,classifies life into three domains: $Bacteria$,$Archaea$,and $Eukarya$. This system is primarily based on differences in $16S$ ribosomal $RNA$ $(rRNA)$ nucleotide sequences. Other factors considered include differences in cell membrane lipid structure (e.g.,ether-linked lipids in $Archaea$ vs. ester-linked in $Bacteria$) and sensitivity to certain antibiotics. Differences in $DNA$ nucleotide sequences are not the primary basis for this specific classification system,as it focuses on the highly conserved $rRNA$ genes.

Column $- I$	Column $- II$
$(a)$ Saprophyte	$(i)$ Symbiotic association of fungi with plant roots
$(b)$ Parasite	$(ii)$ Decomposition of dead organic materials
$(c)$ Lichens	$(iii)$ Living on living plants or animals
$(d)$ Mycorrhiza	$(iv)$ Symbiotic association of algae and fungi

The three-domain system of classification is $NOT$ based on which of the following?

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