When pairing a tone with the presentation of food, Pavlov found that it generally required pairing __________ times before the tone alone would elicit salivation

________ is playful fighting that involves positive emotions

a. Sociodramatic play b. Rough-and-tumble play c. The cycle of coercion d. Parallel play

Which memory area has a capacity of between five to nine items?

a. procedural memory b. short-term memory c. retroactive memory d. sensory memory