Professor Hargrove is interested in the causes of road rage. As part of his research, he is planning to manipulate the temperature inside a car and then measure whether the drivers get angry. Which step of the scientific method is he demonstrating?

The last structures of the eye to develop are

A. ciliary muscles B. corneas C. the muscles that control eye movements and dilator muscles of the pupil D. the anteroposterior portion of the eye

Which research method is most suitable for studying factors that influence behavioral change over time?

A) Longitudinal B) Cohort C) Cross-sectional D) Correlational