Fourth-graders Richard and Bruce sat on the stoop outside the school. They had missed their bus and now had to make the decision whether to walk taking a shortcut or just wait until their mothers noticed they had not arrived home

What are the main functions of the human skeleton? a exchange of gases b support and movement c sensing the environment d digestion and excretion

The double-blind procedure is most for a. random assignment b. the placebo effect c. operational definitions replication d. standard deviations

Which of the following would most likely be a preservationist, as opposed to a conservationist, approach to public land management? i. allowing unrestricted boat access to a lake ii. allowing atv use in all areas of public land iii. closing fragile sections of a park to tourists i only ii only iii only i and iii ii and iii