Kelly called his own theory of motivation a theory

Olaf can reason consistently about real and tangible things. However, he cannot yet reason about abstract ideas or situations. Olaf is probably in Piaget's ______ stage

rational logic preoperational formal operational concrete operational

What are the major teratogens during the fetal period?

a. lack of maternal sleep and lack of exercise b. excessive maternal weight gain and maternal age c. malnutrition and tobacco d. sugar and starch