Aresearcher is investigating motor ability by simultaneously studying three groups of youngsters: ages 6, 10, and 14 years. which research strategy is the researcher using?

Cross-sectional

Explanation:

Cross-sectional research: A cross-sectional research is also referred to the as transverse study, cross-sectional analysis, or prevalence study.

The term cross-sectional research is an observational method of research in which collected variables data is being analyzed at a given time for a particular population.

Cross-Sectional research usually gathers information about a particular population to make inferences about that population at a given time. In cross-sectional research, the researcher or experimenter usually uses a different or fresh sample of people whenever they start research.

to stay where they were until m sent for

explanation:

may i ask what challenges?