An experiment in which the lifestyles of people with lung cancer are compared with the lifestyles of those who do not have lung cancer is an example of 1- a case-control study.

2- the scientific method.

3- an observational study.

4- a human-intervention study.

1- a case-control study

Explanation:

A case–control study is a type of observational study in which two existing groups differing in outcome are identified and compared on the basis of some supposed causal attribute.

you can get herpes by biting ur nails

explanation:

just be there for her.

explanation:

not necessarily literally but figuratively. also don't say things like "i understand how you feel", because even though you are trying to , you clearly don't understand how she feels (i'm gonna go out on a limb here and assume you've never had a heart attack). also just let her rest. that is one of the best things for you to do.