When a researcher conducts an experiment, and is fairly certain that changes in the independent variable caused changes in the dependent variable, that experiment is said to be high in ____________________

Zelda is a junior high school teacher. When a student acts up, she prefers to modify the student’s behavior with the use of extinction. Therefore, Zelda is most likely going to ____

a. ?demonstrate an appropriate behavior for the student b. ?present an unpleasant stimulus c. ?eliminate reinforcement of the misbehavior d. ?reward the student for appropriate behaviors

Carriers of the sickle cell gene __________

A) often do not display symptoms until after they have passed the gene on to their children B) can be treated during infancy if placed on a diet that is low in phenylalanine C) are more resistant to malaria than are individuals with two alleles for normal red blood cells D) develop sickle-shaped red blood cells that cause degeneration of the nervous systems