What marine animal is a close relative of the elephant, despite living exclusively in water?

Manatee

What sport is central to the "Rocky" movie series? What is the name of Shrek's donkey friend? Which popular holiday plant was commonly used in Native American ceremonies and found at early Thanksgiving events? Which famous composer wrote the "Hungarian Rhapsodies"? Which famous Marvel Comics event features a collision between multiple Earths leading to a new unified universe?