flippers are used for moving in water & an ocean is a kind of body of water ->  flippers can be used for moving in the ocean  flippers can be used for moving in the ocean & flippers are a part of a sea turtle ->  flippers can be used by sea turtles for moving in the ocean  where an animal lives is that animal's habitat & a sea turtle lives in the ocean ->  the ocean is a sea turtle's habitat  flippers can be used by sea turtles for moving in the ocean & the ocean is a sea turtle's habitat ->  flippers can be used by sea turtles for moving in their habitat  flippers can be used by sea turtles for moving in their habitat & if something is used for a process, then that something helps that process -> flippers can help sea turtles move in their habitat