For a long time,it was thought that cilia were unimportant or _________,despite their presence on almost all cells.This idea arose because the cilia on most cells are non‐motile,and it was assumed that motility was the key function of cilia.

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The context suggests that cilia were considered unimportant or unremarkable despite their presence on almost all cells, and the assumption was that motility was the key function of cilia. This suggests that the cilia on most cells were non-motile and possibly "vestigial," meaning that they were remnants of functional structures that were once important but had lost most or all of their function over evolutionary time.

For a Long Time,it Was Thought That Cilia Were Unimportant