Final answer:
A cross-sectional study represents a study of both exposure and disease at one point in time. It involves collecting data from a sample of subjects just once at a particular moment. Researchers can examine the prevalence or incidence of a disease and its relationship to certain exposures or factors.
Step-by-step explanation:
A cross-sectional study represents a study of both exposure and disease at one point in time. In this type of observational study, data is collected from a sample of subjects just once at a certain point in time. It provides a snapshot of the population at that particular moment, allowing researchers to examine the prevalence or incidence of a disease and its relationship to certain exposures or factors.