An adult sponge is sessile (anchored in place) and does not move.
The adult sponge can reproduce asexually (via budding) or sexually utilizing sperm and ova.
When reproducing sexually, the fertilized ova become larvae that have cilia that the larvae can use for locomotion.
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It is true that in multicellular organisms cilia and flagella are the major means of locomotion. Locomotion is one of the characteristics of living organisms.
It is hopping, like in a kangaroo rat
the nervous system
The word "flagella" is plural so the proper term to use for this question would be "flagellum". A flagellum is an organ of locomotion in single cell organisms. In other words, the flagellum help the organism move around.
Flagellum are used to propel microscopic organims like, bacteria. Some microscopic organisms have many some have just one or two. But much like the fins and tails of fish through the proper function of flagellum the organism gets where it needs to go.