Evolution of the cochlea of the ear, consisting of the scala media, the scala tympani, and the scala vestibuli. Regarding mammals, placental and marsupial cochleae have similar cochlear responses to auditory stimulation as well as DC resting potentials. This leads to the investigation of the relationship between these therian mammals and researching their ancestral species to trace the origin of the cochlea. This spiral-shaped cochlea that is in both marsupial and placental mammals is traced back to approximately 120 million years ago. The development of the most basic basilar papilla (the auditory organ that later evolved into the Organ of Corti in mammals) happened
Jock Stirrup – Iraq. Stirrup strongly backed Mohan's plan but noted that Mohan would need to be pressed hard to deliver and also supported with Corps forces. Austin was reluctant to provide support, wishing to focus on Mosul, but Petraeus agreed with Stirrup. However, this plan was overtaken by Maliki's decision to launch Operation Charge of the Knights. Both Stirrup and the American commanders were taken by surprise and were concerned about the lack of planning but Maliki was determined to launch his operation in late March. Operation Charge of the Knights led to the Battle of Basra which lasted from 25