________ is a stress hormone that may be elevated in children who have been abused

If your score has a percentile rank of 60, then 60% of the scores are higher than your score.

a. true b. false

Baby Aaron has a habit of sucking his thumb. Baby Aaron is probably in Substage _____ of Piaget's sensorimotor stages

A) 1 B) 2 C) 3 D) 4