*Q:09 Correct Answer* ✅ *(2) Both A and R are true but R is NOT the correct explanation of A* > *Explanation:* R.H. Whittaker’s five-kingdom classification (Monera, Protista, Fungi, Plantae, Animalia) was based on cell structure (prokaryotic/eukaryotic), mode of nutrition (autotrophic/heterotrophic), body organization, and phylogenetic relationships. > However, R does not explain A because the classification system is based on multiple criteria (as stated in A), not just the grouping of unicellular eukaryotes.