According To definition of Lichens: Lichens are symbiotic associations of a fungus with the photosynthetic partner called as phycobiont such as green algae or cyanobacteria.gain, The two organisms live in close association with each other and both get benefit from this kind of association, this is called Symbiotic Association. By the way, Parasitic relation means living in or on another organism (host) and causing harm to it.
The White Nile (Arabic: Ø§ÙÙÙÙ Ø§ÙØ£Ø¨ÙØ¶ââ an-nÄ«l al-'abyaá¸) is a river in Africa, one of the two main tributaries of the Nile; the other is the Blue Nile. In the strict meaning, White Nile refers to the river formed at Lake Victoria, at the confluence of the Bahr al Jabal and Bahr el Ghazal Rivers.
The Nile River is a famous river that flows through Egypt and feeds into the Mediterranean Sea. In addition to Egypt it runs through Uganda, Ethiopia, Sudan, and South Sudan. The rivers that form one of the two upper sections, the White Nile, also flow through Burundi, Rwanda and Tanzania.ther: Length - 6,650 km (4,130 miles). Although the Nile is not the largest river in volume, it is one of  the longest rivers in the entire world. The Nile runs through the  countries of Egypt, Sudan, Ethiopia, Uganda, Zaire, Kenya, Eritrea,  Tanzania, Rawanda, and Burundi.