I think the sea waves blow them across the sea floor
no
Starfish have been known to live as deep as 6000m
Yes starfish do swim. Starfish have little tentacles that help it move on sea surfaces.
A starfish doesn't swim, it crawls.
Both can swim.
A starfish does not swim
Star fish foat
Starfish don't swim they crawl around very slowly on rocks in the ocean on their "feet". Sometimes the current can unstick them from their rocks and make them momentarily be "waterborn" but this is not swimming.
It really depends on what kind of a swimmer you are. If you can swim really well, you can probably swim really far. If you can't swim at all, you won't swim very far. I hope this answers your question.
As far as a blue whale can swim in a year
they swim as long as they can
According to my science book, they just swim away when they are born.