How come one type of matter can be converted to a totally different type

What type of competition exsist between two species. turtles and fish

Anurse is in the dining room and overhears a new nurse tell a client with body dysmorphic disorder that she's much too thin and must eat more before she can go home. the client bursts into tears and runs out of the dining room. what is the best way for the nurse to address this situation?

Which level of taxonomy has the fewest organisms?