The _____ period is the longest stage of prenatal development

Sixteen-year-old Elias was frustrated to have to move and leave a high school he really liked

At his old school, he had many friends and the support of his teachers. He found his new school much different and had difficulty finding his place there. Though Elias was an excellent student at his old school, he quickly learned that he would have to abandon that to fit in with the new group of friends that appeared to be accepting him. Because he felt his need for friends and acceptance was greater than his need for good grades, he let his grades slide. Which of the following concepts best explains why Elias put forth little effort in his school work at his new school? a) the matching hypothesis b) conformity c) obedience d) the fundamental attribution error

Wendy wants to study how easily people make friends. She assigns people to talk with a stranger for either five minutes or ten minutes, and assigns people who are more outgoing to the "five-minute" condition, and shy people to the "ten-minute" condition

Which of the following is the threat to the internal validity in this study? a. The independent variable isn't held constant for every participant in a condition. b. Dependent variables are not being assigned randomly. c. She did not select from a random sample in her population. d. Wendy did not use random assignment.