Chicken skin appears as red or white bumps that usually start to appear on the buttock, upper arms, legs or cheeks. These will often be rough and the skin that is covered in the bumps may be itchy. Because it is less humid during this time, the rash will often appear more frequently in the winter.
The principle of faunal succession is based on the four assumptions of (1) the validity of the principle of superposition; (2) the sequence of fossils are the same everywhere (3) rock layers of different ages will contain different types of fossils; and (4) the validity of the principle of original horizontality. î î î.
Primary ecological succession is the changing sequence of communities starting with the first biological occupation of a place where there were no living organisms previously. For example, the colonization and the following succession of communities on a bare rock is a case of primary ecological succession. Secondary ecological succession is the changing sequence of communities starting with the substitution of a community by a new one in a given place.