From the __________, tiny __________ emerge, which burrow into the uterine wall and start to develop the placenta

Research suggests that relative finger length and sexual orientation are correlated. This is likely because both factors are affected by

A) prenatal estrogen levels. B) nutrition during childhood. C) prenatal testosterone levels. D) a gene on the X-chromosome.

Altruistic behavior is most likely to occur if ________

a. your values are dissimilar to those of the other person b. there are others present c. you feel personally responsible for the other person d. you feel guilty and uncertain