Dr. mitchell is conducting a research study on temperament. as a basis of this study, he plans to follow 1,000 subjects from the age of 5 to the age of 35. at periodic times he will revisit subjects and their temperament. dr. mitchell’s research study is planned to last for 30 years. which of the following best describes the type of research dr. mitchell is conducting? 1. ethnographic research2. quasi-experimental research3. longitudinal research4. cross-sectional research

longitudinal research

Explanation:

Longitudinal research is a type of research that involves repeated observation of same variables over a long period of time which may be weeks, months and even years. It can be used to draw correlation between variables that do not have several related background variables.  

mali had been a state inside of the ghanaian empire. after ghana fell because of invading forces and internal disputes, mali rose to greatness under the leadership of a legendary king named sundiata, the "lion king." the songhai empire, already weakened by internal political struggles, went into decline.