What is an antigen? Antigen refers to any foreign substance which on entering the body  stimulates the production of antibodies in the body of the  individual as a part of the immune response.
Gen Z Defined. Gen Z consumers range from ages 2 to 19, though the target range for marketers lies from ages 11 to 16. Gen Z is the most diverse and multicultural of any generation in the U.S. -- 55% are Caucasian, 24% are Hispanic, 14% are African-American and 4% are Asian. Gen Z Beliefs.
âThere is no consensus over the exact birth dates that define Gen Y, also known by some as echo boomers and millennials. But the broadest definition generally includes the more than 70 million Americans born 1977 to 2002. Generation X was born roughly 1965 to 1976. Narrower definitions put Gen Yers as those ages 16 to 27, born from 1978 to 1989.â