Ava wants to design a study in which the causes and effects are measured at the same point in time because it is more cost-efficient. This type of study design is called

Rachel has found that when she opens the cupboard door to get the cat food, the cats come running to the kitchen. Rachel knows that this is classical conditioning and that the unconditioned stimulus is the ________

a. cupboard door opening b. cat food c. running of the cats d. cat

_____ is a visual disorder in which the lens thickens and individuals have difficulty viewing nearby items

Fill in the blank(s) with correct word