Some conditions can cause the absence of OAE's. These include: cysts, external otitis (swimmer's ear for example), stenosis, or abnormal middle ear pressure, a perforated ear drum, otosclerosis, cholesteatoma.
The Gulf of Mexico (Spanish: Golfo de MÃ©xico) is an ocean basin largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by Mexico, and on the southeast by Cuba.
The Gulf of Mexico contains an affluent biodiversity of animals and is home to many different aquatic species such as plankton, fish, squid, shrimp, crab and oysters, which are important for maintaining the health of this basin and feeding other marine animals such as whales, dolphins, porpoises and seabirds.