Nile is considered the Father of African Rivers. It is Stretching for approximately 6,695 km across 10 different countries, the Nile River is the longest river in the world.
Coral lives a symbiotic life. Inside the sac of each coral polyp lives one-celled algae called zooxanthellae.Algae gives off oxygen and other nutrients that the coral polyp needs to live and in return the polyp gives the algae carbon dioxide and other substances the algae needs.