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

[EX Q]: When scientists work in natural settings rather than a lab, it is called what?
[EX A]: fieldwork

[EX Q]: Adding the number of protons plus the number of neutrons in an atom, decides it's approximate mass, what is another word for this value?
[EX A]: atomic number

[EX Q]: Noninfectious diseases can't be passed from one person to another. instead, these types of diseases are caused by factors such as environment, genetics and what?
[EX A]:
lifestyle