Twins who are produced when two separate ova are fertilized by two separate sperm at roughly the same time are called ________ twins

According to evolutionary psychologists, why would Doris be more likely to save her children than her parents in a life-threatening emergency? Doris's children

a. are more likely to pass on her genes. b. are less likely to be able to save themselves. c. share more genes in common with Doris than do her parents. d. are more likely to seek Doris out than are her parents.

Decisions that are made by committee tend to be less-than-optimal. This is mostly because such decisions ____

a. are usually based on limited information b. are usually made under tight time pressure c. are usually made under stressful circumstances d. do not have the benefit of a strong, directive leader