Evolution of the cochlea signals that displace the eardrum by a mere picometre. Because of its prominence and preserved state in the fossil record, until recently, the ear had been used to determine phylogeny. The ear itself contains different portions, including the outer ear, the middle ear, and the inner ear and all of these show evolutionary changes that are often unique to each lineage [14]. It was the independent evolution of a tympanic middle ear in the Triassic era that produced strong selection pressures towards improved hearing organs in the separate lineages of land vertebrates. The cochlea is the tri-chambered auditory detection portion
Jock Stirrup in Oman Stirrup flew BAC Strikemasters during the Dhofar War in the close air support and interdiction roles, giving him valuable battle experience of the use of air power in counter-insurgency operations. After he returned to Great Britain in 1975, Stirrup was posted to No. 41 Squadron where he flew the SEPECAT Jaguar in the fighter reconnaissance role. Stirrup went on to serve in an exchange tour in the United States where he flew the all-weather tactical reconnaissance RF-4C Phantom. Promoted to squadron leader on 1 January 1980, Stirrup was serving as a flight commander on No. 226 Operational Conversion