According to Paul Ekman, which of the following is one of the universal facial expressions?

If a boy believed that the only variable that affected the distance a ball traveled when thrown was the force with which it was thrown and then conducted a biased "experiment" that proved his assumption which developmental phenomenon according to Piaget is involved?

a. Object permanence b. Conservation c. Concrete operations d. Formal operations

Groupthink is a technique that groups can use to make sound decisions

Indicate whether the statement is true or false.