Dana has the ability to easily cope with unexpected and challenging situations. She generates solutions to problems by relating unexpected situations to familiar situations. In this scenario, Dana is exhibiting _____

The purpose of the _____ is to protect the body against the invasion of bacteria, viruses, fungi, or other illness-producing organisms

A) antigens B) lymphocytes C) phagocytes D) immune system

When Pavlov observed that his dogs would salivate at the sound of rattling food dishes, he called these learned involuntary responses__________

a) unconditioned responses. b) conditioned reflexes. c) unconditioned stimuli. d) conditioned stimuli.