Answer:
A longitudinal study
Explanation:
A longitudinal study can be used to discover relationships between variables that are not related to various background variables. This observational research technique involves studying the same group of individuals over an extended period.
Maybe because they're in love with the person and believed that it won't happen again.
Communication barriers can be physical disabilities such as hearing problems or speach problems but it can also be the lack of interest, attention differences in viewpoint etc.
Its either angioplasty or IABP (Intra aortic balloon pump)
I would say lung cancer. Smoking affects ur lungs the most
