In a naturalistic observational study, making sure the setting is "ordinary" helps to enhance the __________ of the behavior being investigated

A(n) ________ is an innocuous substance that has no specific physiological effect

A) placebo B) agonist C) drug D) pseudotransmitter E) ligand

Identify the correct sequence of developmental intervals, from youngest to oldest

a. Prenatal :: infantile :: perinatal b. Infantile :: perinatal :: prenatal c. Perinatal :: prenatal :: infantile d. Prenatal :: perinatal :: infantile