Which of the following best describes protists?

Protists are considered  __________ as they include some but not all descendants of their most recent common ancestor.

Which one of the following is not correctly matched with respect to locomotion in different protists?

In some protists, what is the function of a contractile vacuole?

The figure below shows a phylogenetic tree.

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.