Lung Fish

Lungfish are freshwater rhipidistian fish belonging to the subclass Dipnoi. Lungfish are best known for retaining characteristics primitive within the Osteichthyes, including the ability to breathe air, and structures primitive within Sarcopterygii, including the presence of lobed fins with a well-developed internal skeleton.

 

Today there are only six known species of lungfish, living only in Africa, South Americaand Australia. The fossil record shows that lungfish were abundant since the Triassic.While vicariance would suggest this represents an ancient distribution limited to the Mesozoic supercontinent Gondwana, the fossil record suggests advanced lungfish had a widespread freshwater distribution and the current distribution of modern lungfish species reflects extinction of many lineages subsequent to the breakup of Pangaea, Gondwana and Laurasia. Lungfish have historically been referred to as salamanderfish, but this term more often refers to Lepidogalaxias salamandroides.

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Umar Bin Khatab

Umar (/ˈuːmɑːr/), also spelled Omar (/ˈoʊmɑːr/; Arabic: عمر بن الخطاب‎ ʻUmar ibn al-Khaṭṭāb[ˈʕomɑr-, ˈʕʊmɑr ɪbn alxɑtˤˈtˤɑːb], "Umar, Son of Al-Khattab"; c. 584 CE – 3 November 644 CE), was one of the most powerful and influential Muslim caliphs in history.[6] He was a senior companion of the Islamic prophetMuhammad. He succeeded Abu Bakr (632–634) as the second caliph of the Rashidun Caliphate on 23 August 634. He was an expert Muslim jurist known for his pious and just nature, which earned him the epithet Al-Farooq ("the one who distinguishes (between right and wrong)"). He is sometimes referred to as Umar I by historians of Islam, since a later Umayyad caliph, Umar II, also bore that name.



Umar's political capacity first manifested as the architect of the caliphate after Muhammad died on 8 June 632.[40] While the funeral of Muhammad was being arranged a group of Muhammad's followers who were natives of Medina, the Ansar (helpers), organised a meeting on the outskirts of the city, effectively locking out those companions known as Muhajirs (The Emigrants) including Umar.[40] Umar found out about this meeting at Saqifah Bani Saadah, and, taking with him two other Muhajirs, Abu Bakr and Abu Ubaidah ibn al-Jarrah, proceeded to the meeting, presumably to head off the Ansars' plans for political separation. Arriving at the meeting, Umar was faced with a unified community of tribes from the Ansar who refused to accept the leadership of the Muhajirs.[40] However, Umar was undeterred in his belief the caliphate should be under the control of the Muhajirs.[41] Though the Khazraj were in disagreement, Umar, after strained negotiations lasting one or two days, brilliantly divided the Ansar into their old warring factions of Aws and Khazraj tribes. Umar resolved the divisions by placing his hand on that of Abu Bakr as a unity candidate for those gathered in the Saqifah. Others at the Saqifah followed suit, with the exception of the Khazraj tribe and their leader, Sa'd ibn 'Ubada, who were ostracized as a result. The Khazraj tribe is said to have posed no significant threat as there were sufficient men of war from the Medinan tribes such as the Banu Aws to immediately organize them into a military bodyguard for Abu Bakr.[40]


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