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Why is the kingdom "Protista" not valid under evolutionary classification?
A. Protists are all very similar and easy to confuse
B. Protista contains groups that share closest common ancestors with other groups, rather than with each other.
C. Protists are the most numerous organisms on Earth.
D. Protista evolved before any other kingdom, and as such share a most recent common ancestor with each other, as opposed to any other group.
B