From the time a baby is born, what is she or he eager to do? A. smile at her parents and primary caregivers

B. explore her world and interact with others

C. play with her parents, primary caregivers, and toys

D. sleep the majority of the time

Dr. williams conducted a survey in the mall, measuring the shopping habits of people ages 15, 25, 35, 45, and 55, with 10 people in each group. which of the following best describes her study? an experiment a cross-sectional study a case study a longitudinal study a double-blind study