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 Staff in 2006: during his time in office the British Armed Forces faced significant commitments both to Iraq (Operation Telic) and Afghanistan (Operation Herrick). Stirrup retired as Chief of the Defence Staff on 29 October 2010, taking a seat in the House of Lords in 2011. Graham Eric Stirrup was born on 4 December 1949, the son of William Hamilton Stirrup and his wife, Jacqueline Brenda Stirrup ("née" Coulson). He was educated at Merchant Taylors' School in Northwood, Hertfordshire. Stirrup married Mary Alexandra Elliott in 1976 and they have one son. Stirrup includes golf, music, theatre and history among his