The Japanese word for Japan is æ¥æ¬, which is pronounced Nippon or Nihon and literally means the origin of the sun. The earliest record of the name Nihon appears in the Chinese historical records of the Tang dynasty, the Old Book of Tang.
Primary versus Secondary Immune Response The primary immune response occurs the first time that the immune system comes in contact with the antigen.
Primary & Secondary Sexual Characteristics. Primary and secondary sexual characteristics refer to specific physical traits that differentiate males and females in sexually dimorphic species; that is, species in which males and females look different. Primary sexual characteristics are there from birth (for example, penises vs. vaginas).