In Pavlov's original experiment of classical conditioning, dogs learned to salivate at the sound of a bell when the bell was repeatedly paired with the presentation of food. The food is referred to as the unconditioned response

According to _____, color vision evolved because perceiving color helped our early ancestors forage for food

A) binocular theory B) trichromatic theory C) opponent process theory D) gestalt theory

The period of development from conception to birth is called the __________

a. neonate period b. prenatal period c. natal period d. postnatal period