How are viruses and pathogenic protozoa similar? they are both multicellular organisms. they are both part of the protista kingdom. they both cause communicable diseases. neither microorganism can reproduce on its own.

They both cause communicable diseases.

Explanation:

A communicable (or infectious) disease is spread directly or indirectly from person to person, they are caused by microorganisms like bacteria, viruses, parasites, pathogenic protozoa, etc. Therefore the correct answer is They both cause communicable diseases, this is confirmed because protozoa and viruses are no multicellular, viruses are no protistas and viruses can't reproduce by themselves.

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