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Final answer:

Bacteria can be both harmful and beneficial, while protozoa are single-celled eukaryotic organisms.


Explanation:

False. Not all bacteria are harmful. While some bacteria can cause diseases like tuberculosis and cholera, many bacteria are essential for processes such as digestion and nutrient cycling.

True. Protozoa are single-celled eukaryotic organisms that lack a cell wall. They are not animals but are classified as protists.


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