The answer is stroke. This means that formation of plaque in the blood vessels that serve the brain cause thickenning of the inner walls of the vessels. When the plaque ruptures, a blood clot forms and blocks blood passage to a particular region of the brain served by the vessel. This stifles oxygen supply to the respective part of the brain leading to the death of the cells in the region.
<span>The quality of Australian land is unique as the properties of the earth crust are different. There is no much of evolution of land and is an isolated space which is the reason for the said placental mammals do not habitat there but has their own diverse kind of these marsupials.</span>
