Given a scientific question, generate a correct answer to it.

[Q]: A pedigree is a chart which shows the inheritance of a trait over several what?
[A]: generations

[Q]: What is the lowest level of organism that can perform all activities required for life?
[A]: cell

[Q]: What term is used to describe an immunity that occurs after exposure to an antigen either from a pathogen or a vaccination?
[A]:
adaptive immunity