The test may cause momentary gagging because the back of the throat is a sensitive area, but it should not be painful. The sample your doctor collects is taken to a laboratory, where it is put on a plate that allows any bacteria on it to grow. This process is called a culture.
Often these are called transition zones which represent the start and end of a specific region and can be large or small. For example, the transition zone between Sub-Saharan Africa and North Africa is rather large because there is a mixing between the two regions. Regional geographers study this zone as well as the distinct characteristics of Sub-Saharan Africa and North Africa.
The Sahel is the transitional zone between the Sahara and the tropical savanna (the Sudan sÃ»dÃ¢n) region and-forest savanna mosaic to the. South The horn Of africa And Southern sudan are geographically part of-Sub Saharan, africa but nevertheless show Strong Middle eastern influence and are also part of The arab. worldince around 5,400 years ago, the Saharan and sub-Saharan regions of Africa have been separated by the extremely harsh climate of the sparsely populated Sahara, forming an effective barrier interrupted by only the Nile River in Sudan, though the Nile was blocked by the river's cataracts.