In which sentence is the underlined word a grenud dolphins are breathing only when they are above the water , even the microscopic bug was a tiny breathing creature breathing is a basic function controlled by the brain

"''Breathing'' is the word in the sentence "''Breathing'' is a basic function controlled by the brain" that is a gerund. The correct option among all the options that are given in the question is the second option or option "B". I hope that this answer has come to your great help.