The theory that the selection of one's partner is based on similarity is referred to as _______________ mating

Research conducted by Berndt & Mekos (1995) found which of the following benefits from the transition to secondary school among adolescents in the United States?

a. better skills in science and mathematics b. improved critical thinking skills c. closer relationships with parents d. greater independence in adolescents

You are a researcher and want to investigate the differences between genetics and the environment. Who are the ideal participants for your study?

a. identical twins raised by different parents b. identical twins raised by the same parents c. daughters raised by single fathers d. sons raised by single mothers