Answer:
b. ex post facto or quasi-experimental.
Explanation:
An ex post facto search is done when a researcher cannot manipulate one of the variables such as sexual behavior or smoking (as described in the question), ie this type of research is done when it is not possible to manipulate the independent variables as they already arrive ready for research. Ex-post fact research deals with variables that are unmanipulated in nature. Quasi-experimental research can also be done for this same situation.
It will ruin your body system and it will make some things omn you
Nail bitting is a unhealthy habit because you're damaging your nails and plus there is so much bacteria under them. How you could stop it is put a rubber band around your wrist and snap it every time you feel like bitting them? Haha idk.
Alcohol stay 10 hours or more and your body
I hope that's help !
