Answer:
d.clearer picture of a phenomenon than single experiments observed in isolation
Step-by-step explanation:
Meta analysis is a statistical analysis that brings together results from different scientific research to make "clearer" estimates which are more closer to the unknown results than each of the individual scientific experiments. Meta analysis is usually conducted when there are several scientific studies researching or bordering on one question. Each scientific result is addressed under meta analysis in consideration of the estimated degree of error of each of them.