Final answer:
To determine the structure(s) an unknown protist used to move based on a video that did not show any actual locomotory structures, one can make an inference based on the information provided.
Step-by-step explanation:
To determine the structure(s) an unknown protist used to move based on a video that did not show any actual locomotory structures, you can make an inference based on the information provided. Many protists have whip-like flagella or hair-like cilia that they use for locomotion. Some protists also use pseudopodia, which are cytoplasmic extensions, to move themselves forward. Therefore, if the video did not show any flagella, cilia, or pseudopodia, it is likely that the unknown protist used another method of movement that was not captured in the video.