Describe the difference between longitudinal and cross-sectional research

While both longitudinal and cross-sectional research are observational studies, where they differ is the sample that is being observed.

Responses may vary but should include some or all of the following information:

Longitudinal studies observe and analyze sample data over a period of time, whereas cross-sectional studies observe sample data one time and compare the data with other groups.

recent news about two years ago indicates that a polish forestry student by chance unearthed at a depth of about 40cm (16 inches), during digging in a damp polish forest he found a 13-page manuscript into a thermos flask.

greek jew marcel nadjari was a aischwitz slave who witnessed how the nazi's built big death chambers and crematoriums and told how he was forced to escort fellow jews to the gas chambers. he accounts on this manuscript how the nazi's disguised this chambers to look like showers. also, he describes this place as a process of extermination from the chambers to the trains arriving to take the bodies.