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Protist Cells
27. Protists / Introduction to Protists / Problem 3

The figure below shows a phylogenetic tree. 

Phylogenetic tree illustrating relationships among prokaryotes, protists, animals, and fungi.

Based on the above phylogenetic tree, what is the true order of difficulty to develop drugs to combat human pathogens that are prokaryotes, protists, animals, or fungi? (You do not need to consider the evolution of drug resistance by the pathogen. 

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