HELP ME OUT PLEASE are preparation of pathogens introduced to the body to cause an immune responses

a) Vaccines

b) Germs

c) Communicable diseases

Ireally need to know this answer asap

Wjat are substances intentionally added to food to produce a desired effect?

In a two to three page paper, examine the history and development of the healthy people initiatives. discuss some of the successes and shortfalls of the three initiatives thus far; including healthy people 2000, healthy people 2010, and healthy people 2020. be sure to include statistical data from the initiatives to support your position. don't forget to cite your sources.