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(A) The phylogenetic classification of organisms,particularly within the kingdom $Monera$,is based on the analysis of $16S$ ribosomal $RNA$ $(rRNA)$ s

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Archaebacteria

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(A) The phylogenetic classification of organisms,particularly within the kingdom $Monera$,is based on the analysis of $16S$ ribosomal $RNA$ $(rRNA)$ sequences. $Archaebacteria$ are considered the most primitive organisms because their $rRNA$ sequences show significant differences from those of $Eubacteria$ and $Eukaryotes$. These organisms are adapted to extreme environments,which is a characteristic feature of early life forms on Earth. Therefore,based on molecular phylogeny,$Archaebacteria$ are identified as the most primitive group among $Monerans$.

The nucleotide sequence in ribosomal $RNA$ provides the best evidence for the phylogeny of Monera. Based on this information,which are the most primitive Monerans?

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