Which of the following scientists expanded the original two kingdom classification system by adding a third, comprised of single-celled eukaryotes and prokaryotes?

Question

Which of the following scientists expanded the original two kingdom classification system by adding a third, comprised of single-celled eukaryotes and prokaryotes?​

Which of the following scientists expanded the original two kingdom classification system by adding a third, comprised of single-celled eukaryotes and prokaryotes?