The number of best friends that children have tends to increase until about age _______, and then children become much more selective in whom they designate as their best friends

Though not entirely conclusive at this point, research by Simon LeVay and others have demonstrated that homosexuality may be linked with a smaller _____ in the brain

Fill in the blank with correct word

A biological view of adolescence emphasizes:

A) genetic factors. B) evolutionary history. C) sexual maturation. D) all of the above