In the 1990s, many scientists agreed that the five-kingdom classification scheme should be expanded to six kingdoms. Which discovery supported this decision?
A. Fungi differed significantly from both plants and animals.
B. Two groups of monerans—Eubacteria and Archaebacteria—differed significantly from one another.
C. Protists are not a true kingdom, and should be classified in at least two different kingdoms.
D. Fungi are not a true kingdom, and should be classified in at least two different kingdoms.
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