Social system of rights and duties based on land tenure and personal relationships
Answer:
I think this will help....i didnt wanna give the actually awnser so here
Explanation:
The Ghana Empire (c. 700 until c. 1240), properly known as Wagadou (Ghana or Ga'na being the title of its ruler), was a West African empire located in the area of present-day southeastern Mauritania and western Mali. Complex societies based on trans-Saharan trade in salt and gold had existed in the region since ancient times,[1] but the introduction of the camel to the western Sahara in the 3rd century CE, opened the way to great changes in the area that became the Ghana Empire. By the time of the Muslim conquest of North Africa in the 7th century the camel had changed the ancient, more irregular trade routes into a trade network running from Morocco to the Niger river. The Ghana Empire grew rich from this increased trans-Saharan trade in gold and salt, allowing for larger urban centres to develop. The traffic furthermore encouraged territorial expansion to gain control over the different trade routes.
Muscle ischemia is the pathophysiologic alteration precedes crush syndrome after prolonged muscle compression
Physiological and the anatomical studies show that when irreversible muscle cell damage starts after 3 h of the ischemia and is nearly about complete at 6 h. These muscle is going to changes are paralleled by the progressive of microvascular damage.
The most common symptom of the myocardial ischemia is called as angina (also called angina pectoris). This is the chest pain (similar to the indigestion or the heartburn) that feels like: Chest discomfort and some Heaviness.
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