Steven, a 6-year-old, can correctly name objects, catch a ball and throw it, and write his abcs in proper sequence. his younger brother harvey is much less speedy and skillful in all of these areas. what is the best explanation for steven's superior performance?

Francine, a college freshman, has agreed to participate in a psychology research study. before she begins her participation, she reads a statement written by the researcher explaining the purpose of the research and the potential risks of participation. it also explains that francine is free to withdraw from the research at any time. in providing francine with this statement, the researcher has followed the ethical guidelines of for participants.