Mark is a graduate student who is studying identity formation. he interviews a group of 5-year-olds, a group of 10-year-olds, and a group of 15-year-olds and asks them what they plan to be when they finish school. in this example, mark is using a research design.

cross-sectional      

Explanation:

Cross-sectional research design: It involves various group of people who shares few characteristics but differs in the variable of interest, such as educational background, ethnicity, and socioeconomic status. Researchers who study developmental psychology often use cross-sectional research studies.

Example: A researcher can collect cross-sectional data related to current diagnoses of lung cancer and past smoking habits.

it apply by theyre artifacts

muslims have taken his goods and products to different parts of asia an indonesia. sometimes just traveled and trade, but in other occasions, stayed in the place and made a living.

trade was the key for muslims economies to prosper. their commerce routes reached far places like malaysia and java in the 11th century.

another important factor for prosperity was that muslim states served as the middle point for european traders.

they used to travel by land but sailing the seas -the indian ocean- really increase the exportation of products.