Пре­об­ра­зуй­те, если это не­об­хо­ди­мо, слово NOT HAVE так, чтобы оно грам­ма­ти­че­ски со­от­вет­ство­ва­ло со­дер­жа­нию тек­ста.

Fish _________ ears, but they do have a structure inside their head that is very much like our own inner ear.