Using both independent and dependent variables is associated with which of the following types of research used in psychology?

An adolescent ______ is most likely to reason less maturely than a young adult

learning about the workings of refrigerators researching the history of the U.S. presidency debating whether teens should be allowed to drink studying for a calculus exam

Despite its dangers, a young man continues to take cocaine because of the feeling of euphoria it produces for him. This powerful arousal of his nervous system is probably due to cocaine's ability to

A) inhibit enzymes that break down neurotransmitters. B) increase the release of neurotransmitters. C) block the receptor sites for neurotransmitters. D) prevent neurotransmitters from being reabsorbed into presynaptic terminals.