A. They were able to learn more and because smarter and more social. ( I believe )
Answer:
d.clearer picture of a phenomenon than single experiments observed in isolation
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.
Relationships between kings and nobles: nobles serve the king
relationships between noble and knight: they give orders the knights
relationships between noble and peasants: peasants have to obey nobles
i hope this is right and i hope it helps