Answer:
The evidence that a researcher decides to use should be from a credible source and should be track-able.
It can or cannot back the hypothesis created by the researcher. In both cases, the researcher must synthesis it properly into his research. It must build a connection and somewhat extends the points discussed in the hypothesis.
Either way it should have a direction. Something that does not connect to the core of research must not be added in it.
Many people argue on the fall of Rome.
Some people thought it was destroyed by other countries mainly Greece.
Others believe it was too powerful and could not control so it fell by losing power.
The fall of Rome is still unknown.
Answer:Longitudinal research
Explanation:Longitudinal research is a correlational research which focuses on variables and studies them over an extended period of time. It ranges from weeks to years .
How Longitudinal Research Works
This research focuses on a single group of individuals with similar characteristics and studies them over a period of time in order to see if there are any changes that can be observed over that period , for example if one wants to study how exercising improves the life of the middle adults ages 40 to 50 they will study that group for months and keeps observing the changes amongst individuals within this group.